Trail Running Guides - Trailia

Expert, in-depth trail running guides on training, nutrition, gear, races and recovery, written for runners preparing for trail races from 10K to 100 miles. Browse by category. Every guide is available as Markdown by appending .md to its URL.

Training Guides

Expert advice on trail running training plans, techniques and strategies, from a first trail 10K to 100-mile ultras.

Category page: https://trailia.run/guides/training

100 Mile Training Plan: How to Prepare for Your First Trail Ultra (11 min read) A 26-week 100 mile training plan covering multi-week periodization, crew and pacer logistics, mental preparation and honest time-commitment expectations.
50 Mile Training Plan: 23-Week Schedule for Your First 50-Miler (10 min read) A 23-week 50 mile training plan for runners who have finished an ultra: back-to-back-to-back weekends, night running and real-food fueling.
50K Training Plan: The Complete Guide to Your First Ultramarathon (11 min read) A 20-week 50K training plan with explicit HR-zone prescriptions, a real vertical gain cap, a dedicated absorption week most plans skip and a bridge for runners stepping up from 10K.
Trail Marathon Training Plan: 16-Week Template for Your 42K (10 min read) A 16-week trail marathon training plan built around descent training, fueling for 4+ hour efforts and a taper suited to elevation-heavy races.
Trail Half Marathon Training Plan: 10 to 12 Week Template (11 min read) A 10 to 12 week trail half marathon training plan with hill repeats, vertical progression caps and a full week-by-week template you can download free.
DNF in Trail Running: How to Handle It and Come Back Strong (7 min read) Why runners actually DNF, how to decide in the moment, and the written post-mortem that turns a did not finish into the fix for your next ultra.
Trail Running and Your Menstrual Cycle: Training Guide (7 min read) What the research really says about training around your menstrual cycle, why iron matters more than phase, and how to track your own patterns properly.
The Trail Running Glossary: Every Term Explained, FKT to Vert (7 min read) A complete trail running glossary: vert, D+, FKT, ITRA points, Running Stones, cutoffs, power hiking and every other term race documents assume you know.
Trail Running After 40: A Masters Runner's Training Guide (7 min read) What actually changes with trail running after 40, what does not, and how to structure a training week around slower recovery, strength work and higher protein.
How to Convert Road Pace to Trail Pace: The Real Numbers (6 min read) Three ways to convert road pace to trail pace, from the 100 metres of vert rule to Naismith for runners, plus a slowdown table by vertical gain per kilometre.
Trail Running vs Hiking: What's Actually Different? (6 min read) Trail running vs hiking compared properly: energy cost, impact forces, injury patterns, gear and recovery, plus a 12 week plan for hikers moving to running.
How to Read a Topo Map and Use GPX Files for Trail Routes (7 min read) How to read a topo map properly: contour lines, gradient calculation, landforms, plus how to build, load and navigate with GPX files on watch and phone.
How Many Calories Does Trail Running Burn? By Terrain and Pace (6 min read) How many calories trail running burns, calculated properly: the energy cost of gradient, a formula including vertical gain, and why your watch gets it wrong.
Trail Running Intervals: Hill Repeats, Tempo, Descents (11 min read) See how hill repeats, tempo runs, and technical descents train different systems, with sample workouts and a weekly plan for trail runners.
Night Running Training for 100-Mile Races: What Breaks After Dark (10 min read) Night sections of 100-mile races fail runners through predictable cognitive and thermal lows, not poor visibility. Here's what to train instead.
Foot Care for Ultrarunners: Preventing Blisters on Long Runs (9 min read) What the research actually says about preventing blisters on ultra distances, from paper tape trial data to shoe fit, toenail care, and hot-spot management.
Summer Trail Running in the Heat: Gear and Strategies (9 min read) Heat kills pace and performance. Here's what the science says about staying cool, gearing up, and running smart when temperatures climb.
Taper Week Done Right: How to Rest Before Your Trail Race (9 min read) Most trail runners get taper week wrong. Here's what the science says about volume, intensity, sleep, and nutrition in the final 7 days before race day.
Trail Running on 3 or 4 Days a Week: A Training Plan for Busy Runners (9 min read) Short on time but serious about trail running? This training plan shows how 3-4 sessions a week, built around proven science, can still get you to the start line ready.
How to Train for Trail Running: A Complete Guide (9 min read) Trail running demands more than road fitness. Learn how to build the strength, technique, and elevation-specific fitness you need to run trails well.
Trail Running Etiquette: Right of Way, LNT, and Group Runs (8 min read) Master trail running etiquette: who has right of way, how to apply Leave No Trace principles, and how to run respectfully in groups on shared trails.
Pacing Strategy for Trail Races: Why Even Effort Beats Even Pace (10 min read) Chasing pace splits on hilly trails is a recipe for blowups. Learn how even-effort pacing works, how it changes by distance, and how to turn it into splits with Trailia's pacing tools.
Trail Running Cadence: Finding Your Optimal Stride Rate (8 min read) Forget the 180 steps per minute myth. Discover how trail running cadence changes with terrain and learn practical drills to find your optimal stride for efficiency and injury prevention.
Mental Training for Ultra Trail Running: Build Resilience (8 min read) Discover the mental training techniques that separate finishers from DNFs in ultra trail running. Learn to build resilience through visualization, self-talk, and strategic focus.
How to Taper for a Trail Race: A Complete Guide for Runners (8 min read) Tapering for a trail race is a science. Learn how to reduce volume, maintain intensity, and time your taper to arrive at the start line feeling fresh, strong, and fully recovered. Avoid common mistakes and unlock peak performance.
Altitude Training for Trail Runners: The Ultimate Guide to Reaching New Peaks (8 min read) Unlock your potential with our ultimate guide to altitude training for trail runners. Learn the science, methods, and tips to conquer high-elevation races.
How to Train for a Mountain Race: Elevation, Terrain, and Altitude Prep (9 min read) Prepare for your mountain race with specific training for climbing, descending, altitude, and technical terrain.
Trail Running for Weight Loss: Why Trails Burn More Than Roads (8 min read) Trail running burns 30-50% more calories than road running. Learn how to use trails for effective, sustainable weight loss.
How to Transition from Marathon to Ultramarathon: A Step-by-Step Guide (10 min read) Ready for your first ultra? Learn how to bridge the gap from marathon to ultramarathon with smart training, pacing, and fueling strategies.
UTMB Training Plan: 24-Week Schedule and Coaching Guide (11 min read) A week-by-week 24-week UTMB training plan with distance and climbing targets, descent, night and fueling preparation, and a guide to UTMB coaching options.
Trail Running Pace: What Is a Good Pace, and How to Work Out Yours (7 min read) Benchmark trail running paces by road pace and terrain, why trails are slower, and how to judge your own pace, with a free calculator for any route.
How to Start Trail Running: A Couch to Trail Beginner's Guide (11 min read) Everything a beginner needs to start trail running: a 12-week couch to trail plan, a road-to-trail plan, gear, uphill and downhill technique, and staying safe.
AI Trail Running Training Plan Generator: How Smart Plans Beat Generic Templates (12 min read) Discover how AI-powered training plan generators create personalised trail running programs that adapt to your fitness, terrain, and race goals — and why they outperform static PDF plans.
Mobility Work for Trail Runners: Boost Performance & Stay Injury-Free (8 min read) Discover how targeted mobility work for trail runners improves running economy, prevents common injuries, and builds the joint resilience needed for technical terrain.
Data-Driven Training: How to Use HRV and Training Load (10 min read) Learn how heart rate variability and training load metrics can optimize your trail running performance while preventing overtraining and injury.
Progressive Overload for Trail Runners: Adding Volume Without Injury (9 min read) Learn how to safely increase training volume using progressive overload principles. Evidence-based strategies to build endurance while minimizing injury risk.
ITB Syndrome in Trail Runners: Causes, Treatment & Prevention (9 min read) Iliotibial band syndrome affects up to 12% of runners. Learn evidence-based strategies to treat and prevent ITB pain on technical terrain.
Threshold vs VO2 Max Training: Which Matters More for Mountain Races? (9 min read) What VO2 max and lactate threshold each measure, why threshold matters more in long mountain races, and how to balance both kinds of session in training.
How to Run Downhill: Trail Technique That Protects Your Quads (10 min read) How to run downhill on trails: the posture, cadence and foot placement that save your quads, and a progressive plan to build descent strength.
Overtraining Syndrome: Warning Signs Every Trail Runner Should Know (9 min read) Learn to recognize the critical warning signs of overtraining syndrome before it derails your trail running goals. Expert guidance on prevention and recovery.
Recovery Protocols: What to Do After a Long Trail Run or Race (9 min read) Discover science-backed recovery strategies to bounce back faster after long trail runs and races. Learn nutrition timing, active recovery, and when to return to training.
Periodization Explained: How to Peak for Your Goal Race (9 min read) Master periodization to arrive at your goal race in peak condition. Learn how to structure training cycles, balance intensity, and time your taper perfectly.
Vertical Pace and Uphill Running: How to Climb Faster on Trails (12 min read) Measure your climbing with vertical pace, know when to run and when to power hike, train uphill with or without mountains, and pace long climbs on race day.
Heat Training for Ultra Running: Complete Adaptation Guide (9 min read) Master heat acclimation protocols to improve ultra running performance. Science-backed strategies for training in hot conditions safely.
Trail Running Training Plan: Free 8-Week Schedule and How to Build Your Own (18 min read) A free 8-week trail running training plan written in time and effort, with weekly climbing targets, plus the framework to build your own plan for any distance.
Strength Training for Trail Runners: Essential Guide to Power & Injury Prevention (12 min read) Discover how strength training improves running economy, builds power for climbs, and prevents injuries. Science-backed exercises for trail runners of all levels.
Trail Running Coach: Human vs AI Coaching, Costs and How to Choose (10 min read) What a trail or ultra running coach does, how human and AI coaching compare, what online coaching costs, how coaching works for UTMB and 100-milers, and how to choose.
7 Common Training Mistakes Every Trail Runner Makes (And How to Fix Them) (8 min read) From overtraining syndrome to skipping strength work, discover the seven training mistakes holding back your trail running performance—and evidence-based solutions to fix them.
Road Running vs Trail Running Training: The Complete Guide (7 min read) Discover the key differences between road and trail running training: muscle engagement, neuromuscular adaptations, and how to structure your program effectively
Trail Running Training Plan for Beginners: 8-Week Guide (9 min read) A beginner trail running plan: three runs a week for 8 weeks, starting from 20 to 30 minutes of running, with strength work and a gradual introduction to hills.
AI-Powered Training Plans vs Traditional Coaching for Trail Running (10 min read) Discover how AI training platforms compare to traditional coaching for trail runners. We analyze effectiveness, cost, personalization, and which approach fits your goals.
How to Build a Base for Ultra Trail Running: Science-Based Guide (9 min read) Master the foundation of ultra trail running with proven base-building strategies. Learn periodization, mileage progression, and injury prevention.
Cross Training for Trail Running: Build Strength and Prevent Injury (9 min read) Discover how cross training enhances trail running performance, reduces injury risk, and builds resilience through strength work, cycling, and mobility.
How to Plan Your 2027 Trail Running Season (9 min read) A step-by-step guide to planning your 2027 trail running season, from lottery windows and race spacing to training blocks, strength work and monthly check-ins.

Nutrition & Fueling Guides

Science-backed nutrition strategies and fueling plans for trail runners: carbs per hour, hydration, gut training and race-day eating.

Category page: https://trailia.run/guides/nutrition

Gut Training for Ultra Runners: How to Stop GI Distress on Race Day (10 min read) GI distress causes more ultra DNFs than injury. Here's the research-backed gut training protocol to fix it before race day.
How Much Water Do You Need? Trail Running Hydration Guide (8 min read) How much water do you actually need on the trails? A practical trail running hydration guide with hourly targets, sodium ranges, and carrying math.
Sweat Rate Testing: Calculate Your Hydration Needs as a Runner (7 min read) Sweat rate testing takes one run and a bathroom scale. Learn the exact protocol, the formula, and how to turn your number into a race hydration plan.
RED-S in Runners: Warning Signs and How to Fuel Properly (7 min read) RED-S in runners hides behind stress fractures, missing periods, and stalled performance. Learn the warning signs, the energy availability math, and the fix.
Vegan and Plant-Based Fueling for Trail Runners: A Guide (7 min read) Vegan trail running nutrition done properly: protein targets and leucine, the four supplements that matter, and how to solve the fibre problem before a race.
Real Food vs Gels: Build an Ultra Fueling Plan That Works (7 min read) Real food vs gels is the wrong question. Here is when each format works, the carbohydrate targets by race duration, and how to train your gut for both.
Caffeine Strategy for Ultra Races: Timing, Dosage, Tolerance (8 min read) How to ration caffeine across an ultra race: evidence-based doses, overnight timing for 100 milers, and a tolerance taper that sharpens the response.
Post-Race Recovery Nutrition: What to Eat in the First 48 Hours (7 min read) Recovery nutrition after an ultra, hour by hour: what to eat when your stomach has quit, how much protein and carbohydrate, and the mistakes that cost a week.
Real Food vs Gels: Fueling Strategy for 50+ Mile Trail Races (9 min read) Why gels excel early in a 50-mile race, why real food takes over late, and how to build the switch into your race-day fueling plan.
Fat Adaptation for Ultra Runners: What the FASTER Study and Burke's Research Show (9 min read) The FASTER study found record fat burning in keto-adapted ultra runners; Burke's trials found slower race walkers. What both mean, and how to train low safely.
High-Carb Fueling for Trail Running: The Science Behind the Revolution (10 min read) High-carb fueling isn't just for elites. Here's what the research says about carbohydrate targets for trail runners and how to build gut tolerance.
Electrolyte Balance on Long Runs: Sodium, Potassium, and Cramping (9 min read) The science of electrolyte balance on long runs is more complicated than "take more salt." Here's what the research actually says about sodium, potassium, and cramping.
Race Day Nutrition Strategy for Mountain Ultras (10 min read) Fueling a mountain ultramarathon is nothing like a road race. Here's the science-backed strategy that keeps you moving when everything hurts.
What to Eat Before a Trail Race: Race Day Nutrition Timing Guide (10 min read) Your pre-race nutrition can make or break your trail running performance. Learn exactly what to eat, when to eat it, and what to avoid in the 72 hours before race day.
Calories per Hour in Ultra Trail Running: How to Calculate Your Needs (10 min read) Where the 1 kcal per kg per km rule comes from, how climbing, heat and altitude change it, and how to turn your hourly burn into a fueling plan you can stomach.
Carb Loading for Trail Races: Timing and Strategy Guide (9 min read) Master carb loading for trail races with evidence-based timing protocols, portion strategies, and race-day fueling plans for peak performance.
How to Manage Nutrition for Your First Trail Running Race (9 min read) Master race day nutrition with this science-backed guide. Learn fueling strategies, hydration protocols, and common mistakes to avoid in your first trail race.
Trail Running Nutrition: Complete Fueling Guide for Long Runs (7 min read) Master trail running nutrition with our science-backed fueling guide. Learn optimal carbohydrate intake, hydration strategies, and how to prevent GI issues on long runs.

Gear & Equipment Guides

Reviews and recommendations for trail running gear: shoes, watches, packs, poles, headlamps and safety kit.

Category page: https://trailia.run/guides/gear

Best Trail Running Socks in 2026: Blister-Proof Picks (6 min read) The best trail running socks for 2026, plus what actually prevents blisters: fibre, fit, cushioning, and a race-day sock strategy for anything over eight hours.
Best Hydration Vests and Packs for Trail Running in 2026 (7 min read) Which hydration vest should you buy in 2026? Capacity sizing logic, the specs that matter, and honest picks from €30 budget models to full mountain packs.
Chafing Prevention for Runners: Gear, Balms and Heat Fixes (8 min read) Chafing prevention that survives hour six: why damp skin is the worst case, which balms last, and the kit changes that fix thighs, nipples and vest rub.
Satellite Communicators for Trail Runners: inReach vs Zoleo (6 min read) Satellite communicators compared for trail runners: Garmin inReach, Zoleo and SPOT on weight, network coverage and the subscription costs nobody mentions.
Zero Drop vs Cushioned Trail Shoes: Which Is Right for You? (7 min read) Zero drop or cushioned trail shoes? Drop height does not predict injury, but it does move load between knee and Achilles. Here is how to pick and switch safely.
How to Choose a Headlamp for Night Trail Running in 2026 (6 min read) Choosing a headlamp for trail running: why peak lumens mislead, what beam pattern and runtime you actually need, and the best picks from €20 to €200.
Best Budget Trail Running Watches Under 300 Euro in 2026 (6 min read) The best budget trail running watch options under €300 in 2026: which specs matter, what you give up versus a €600 model, and honest picks by race distance.
Best Trail Running Apps 2026: Training, Navigation and Logging Compared (9 min read) Trail running apps compared by what they do: training and coaching apps in one table, navigation, discovery and logging apps in another, with prices checked in October 2026.
Night Trail Running: The Complete Guide to Running in the Dark (9 min read) Everything you need to know about running trails at night. Headlamp selection, safety tips, technique adjustments, and training advice.
Best GPS Watches for Trail Running in 2026: Compared (10 min read) Find the right GPS watch for trail running. We compare the top models for navigation, battery life, and trail-specific features.
Trekking Poles for Trail Running: When and How to Use Them (9 min read) Discover when trekking poles boost trail running performance, proper techniques for uphill and downhill terrain, and how to choose the right poles for your adventures.
Winter Trail Running Gear 2026/27: What to Wear and Carry in Cold and Snow (9 min read) What to wear and carry for winter trail running: layers by temperature, traction for ice and snow, lights, hydration and a safety kit, updated for 2026/27.
Trail Running Gear List: What to Bring on Every Run and on Race Day (10 min read) What to bring trail running, by run length and remoteness, plus the mandatory kit and the gear you need for your first trail race.
Gifts for Trail Runners: Trail Running Gift Ideas for Christmas 2026 (11 min read) Trail running gift ideas for Christmas 2026 by budget and by type of runner, from GPS watches with maps and hydration vests to socks, gels and race entries.

Races & Destinations

Race preparation guides and the best trail running destinations: course guides, lotteries, cutoffs, crewing and race-day checklists.

Category page: https://trailia.run/guides/races

Best Trail Running Destinations in Germany (2026 Guide) (9 min read) From the Zugspitze's alpine ridgelines to Saxon sandstone canyons, these seven regions cover every terrain type German trail runners need.
Best Trail Running Destinations in France: 6 Regions to Run (8 min read) From Chamonix to Corsica's GR20, discover 6 French regions for trail running, with terrain, seasons, and difficulty for every runner.
UTMB Lottery and Running Stones: How Entry Actually Works (6 min read) The UTMB lottery explained without the jargon: what Running Stones are, how the index gates each race, how the draw weights you, and how to improve your odds.
CCC and OCC Race Guide: UTMB's Sister Races Explained (6 min read) CCC and OCC compared: distances, elevation, cutoffs, entry requirements and training plans for the two Mont-Blanc races most runners should target before UTMB.
Best Trail Running Destinations in the UK and Scotland (6 min read) Where to go trail running in the UK: the West Highland Way, Cairngorms, Lake District and Eryri, plus the access rights that decide where you can legally run.
Hardrock 100 Race Guide: Course, Lottery and Altitude (6 min read) The Hardrock 100 explained: 33,000 feet of climbing at 11,000 feet average altitude, how the two-pool lottery works, and what qualifying actually demands.
Western States 100 Race Guide: Course, Cutoffs and Entry (6 min read) A complete Western States 100 guide: the canyons, the 30 hour cutoff, how the lottery and qualifying really work, and a 20 week preparation outline.
Zegama-Aizkorri: Race Guide to Europe's Toughest Skyrace (6 min read) Zegama-Aizkorri explained: 42 km with 2,736 m of climbing, how the February lottery works, and a 16 week plan for the Basque Country's most brutal marathon.
Cutoff Times Explained: How Ultra Race Timing Really Works (6 min read) Ultra marathon cutoff times are a sequence of gates, not one deadline. How organisers set them, how to read a cutoff table, and how to build a plan that holds.
Best Trail Running Destinations in Japan: A Runner's Guide (6 min read) Where to go trail running in Japan: the Japanese Alps, Mount Fuji, Tokyo day trips by train, plus bears, huts, seasons and the races worth travelling for.
How to Crew an Ultramarathon: The Complete Crew Guide (6 min read) How to crew an ultramarathon properly: the aid station routine, what to say and never say, warning signs to watch for, and how to handle the 3am quit request.
Best Trail Running Destinations in California (2026 Guide) (9 min read) From Marin redwoods to Sierra altitude and Yosemite permits, here's where to run trails in California by region, season, and skill level.
Trofeo Kima 2026: Course Guide, History, and How to Train (11 min read) The 52km Trofeo Kima crosses seven 2,500m+ Alpine passes on exposed granite with fixed ropes. Here's the full course guide and how to train for it.
Ultramarathon Drop Bags: What to Pack, With a Checklist by Distance (9 min read) What a drop bag is, what to put in it for a 50K, 50-mile or 100-mile ultra, and how to pack and label it so you are in and out of aid stations fast.
Trail Race Categories Explained: From 10K to 100 Miles (9 min read) Not sure which trail race distance is right for you? This guide breaks down every category from 10K to 100 miles, with training timelines, key demands, and how to pick your next goal.
How to Pace Your First Ultra Marathon: A Beginner's Guide (8 min read) Conquering your first ultra marathon isn't about speed, it's about smart pacing. Learn how to manage effort, tackle hills, and finish strong on the trails.
Lavaredo Ultra Trail: A Complete Race Guide and Preparation Plan (8 min read) Conquer the iconic Lavaredo Ultra Trail 120k. This complete guide covers the course, elevation, training tips, gear, and race strategy for this epic Dolomites adventure.
The Ultimate Trail Race Day Checklist: Run with Confidence (7 min read) Nail your next race with our ultimate trail race day checklist. From essential gear and nutrition to logistics and mental prep, we cover everything you need.
Best Trail Running Destinations in the United States for 2026 (9 min read) Discover America's premier trail running destinations, from Rocky Mountain high-altitude trails to Pacific Coast technical terrain. Expert guide to planning your next running adventure.
Guide to Choosing Your First Trail Running Race: Everything You Need (8 min read) Ready for your first trail race? This complete guide helps you select the perfect distance, terrain, and timing to set yourself up for success on the trails.
Best Trail Running Destinations in Italy: 10 Epic Locations (10 min read) Explore Italy's top trail running destinations from the Dolomites to Sicily. Expert guides on terrain, seasons, and Italian mountain culture.
Best Trail Running Destinations in Europe: 12 Must-Visit Locations (9 min read) Discover Europe's most spectacular trail running destinations, from the Alps to Scottish Highlands. Expert guides to terrain, difficulty, and travel tips.

Recovery Guides

Recovery protocols and injury prevention for trail runners: tapering, sleep, DOMS, common injuries and how to come back from them.

Category page: https://trailia.run/guides/recovery

Massage Guns for Runners: How and When to Use Them (6 min read) What a massage gun actually does for runners, what it does not, a trail-specific routine, and the specs that matter when buying at €40, €150 or €400.
Active Recovery Runs: Pace, Duration and When to Use Them (7 min read) How slow is an active recovery run really? Exact heart rate and pace targets, how long to go, the trail-specific problem, and when a rest day beats running.
DOMS After a Long Trail Run: How Long It Lasts and Fixes (7 min read) How long DOMS lasts after a mountain long run, why descending causes the worst of it, what actually helps, and how the repeated bout effect makes it trainable.
Sleep and Recovery: Why Trail Runners Need More Than 8 Hours (7 min read) Sleep is the recovery intervention with the largest effect and the lowest cost. How much trail runners need, why heavy blocks raise it, and how to get more.
Foam Rolling for Trail Runners: A Complete Routine Guide (7 min read) What foam rolling actually does for trail runners, backed by meta-analyses, plus a six-muscle routine for the tissues climbing and descending load most.
Cold Plunge and Ice Baths for Runners: Do They Work? (6 min read) Cold plunge reduces soreness and blunts adaptation at the same time. What the meta-analyses show for runners, the right protocol, and exactly when to skip it.
How Much Recovery Do Trail Runners Need Between Hard Efforts? (9 min read) Science-backed guide to recovery timing between hard trail sessions: how downhill damage, HRV, and periodization should shape your weekly training structure.
Shin Splints on Technical Terrain: Why They Happen and How to Fix Them (9 min read) Discover why technical trail running triggers shin splints and learn evidence-based strategies to prevent and recover from this common injury.
Trail Running Injuries: Prevention, Treatment, and Recovery (12 min read) From ankle sprains to runner's knee, learn how to prevent, treat, and recover from the most common trail running injuries with science-backed strategies.

Comparisons

How Trailia compares to other trail running apps and tools:

Browse all guides: https://trailia.run/guides
Free trail running tools: https://trailia.run/tools
How Trailia builds training plans: https://trailia.run/methodology
Trailia homepage: https://trailia.run