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Precision tools backed by peer-reviewed research — from running pace and heart rate zones to nutrition and cycling power. Free for every athlete.
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Backed by peer-reviewed research, designed for every athlete — whether you're just starting out or chasing a PB.
52 Science-Backed Calculators
The most comprehensive library of validated sports science tools — covering pace, strength, body composition, and beyond.
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Optimize your nutrition with evidence-based tools for macros, hydration, creatine, carb loading, and race-day fueling.
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In-depth articles written and reviewed by certified exercise scientists. Research translated into practical training strategies.
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Evidence-Based Guides
Understand the science behind your training
Written and reviewed by certified exercise scientists and sports dietitians.
Running Pace Chart: Every Distance from 5K to Ultra
Complete running pace chart for every common distance. Convert pace, speed, and finish times for 5K, 10K, half marathon, marathon, and ultra races.
Heart Rate Zones: The Complete Training Guide (2026)
What are heart rate zones and how do you train in them? Complete guide to the 5-zone system with charts, calculators, and training protocols by certified sports scientists.
How Much Protein Per Day? Science-Based Recommendations
How much protein do you actually need per day? Complete evidence-based guide with intake recommendations by goal, body weight, and sport from a board-certified sports dietitian.
Zone 2 Training: The Science Behind the Most Important Workout
What is Zone 2 training and why do elite athletes swear by it? Complete guide covering the science, protocols, and how to find your Zone 2 heart rate.
What Is a Good 5K Time? By Age, Gender & Fitness Level
Is your 5K time good? Complete breakdown of average and good 5K finishing times by age group, gender, and fitness level — with data from major races and training benchmarks.
FTP Cycling: What It Is, How to Test It, and How to Improve It
What is FTP in cycling? Complete guide to Functional Threshold Power — how to test your FTP, calculate training zones by watt, and improve it systematically.
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