Train Smarter.
Race Better.
Data-driven tools to dial in your nutrition, pacing, and race day strategy.
Even Splits Lab is where endurance training meets real numbers. Our articles break down how to train, fuel, and race smarter, with simple calculators to dial in your pacing, nutrition, sweat rate, and heart rate zones. Built for runners, cyclists, and triathletes who want data they can actually use.
The Lab Tools
Fuel Strategy
Running a half marathon? Most athletes need 60–90g of carbs per hour. Find your exact number in 2 minutes.
Plan Fuel
Sweat Rate
Lose more than 1L of fluid per hour without knowing it? Most athletes do. Find your hourly sweat rate in 2 minutes.
Run Test
Pacing Strategy
Want to run a sub-2:00 half? You need to hold 5:41/km. Enter your goal time and find the pace you actually need to hit.
Find Your Pace
HR Zone Finder
Training in Zone 2 but actually running in Zone 3? It happens more than you’d think. Get your personal zones in 2 minutes.
Find Your ZonesLatest From the Lab
Garmin CIRQA with Forerunner: Do You Need Both?
You already own a Forerunner. It tracks your runs, your sleep and your HRV, and it buzzes at you when you’ve been sitting too long. Then Garmin launched a band with no screen and half your running group started wearing one to bed. Now you’re wondering if you’re missing something, or if two Garmin devices […]
Why Does Zone 2 Feel Harder Indoors? Trainer vs Outdoor Power and Heart Rate
You can cruise along at 150 watts outside, chat with a friend, and feel like you could keep going all afternoon. Put the same 150 watts on an indoor trainer and, 30 minutes later, you’re staring at the clock, sweating through your towel, and wondering why an easy ride feels suspiciously like work. Same bike. […]
2026 Great Trek Half Marathon Review: In the Rain
The Great Trek will always mean something to me. It was my first 5K, back in 2022, and it was cold and raining. This year I went back for my third half marathon, and the forecast said cold and rain again. I finished in 1:46:55, ten minutes faster than my BMO half last year, or […]