Race Lab
Per-race sodium, carb, hydration, and heat plans for the events that matter. Each landing page pre-fills our free tools with the actual climate, elevation, and terrain of your race. Adjust your weight and finish target, the plan generates instantly.
8
Races covered
5
Free tools wired
No
Email required
Yes
Brand-neutral
Pick Your Race
The Events We Plan For
Don't see your race? Use the free tools at /tools with your own conditions.
LOTOJA Classic
The longest single-day USA Cycling sanctioned road race. Cold start, hot finish, three mountain passes between.
Boston Marathon
The oldest annual marathon. Cool spring conditions, qualifying-only field, downhill quad-trashing first half, Newton Hills back half.
IRONMAN World Championship (Kona)
The most prestigious endurance event on earth. Lava fields, ocean humidity, headwinds across the Queen K Highway. Heat strain defines the day.
Leadville Trail 100 Run
Race across the sky. 100 miles between 9,200 and 12,600 feet of elevation. Hope Pass twice. 30 hour cutoff.
UTMB
The Ultra-Trail du Mont-Blanc. 106 miles, 32,800 feet of climbing, three countries, one of the deepest ultra fields in the world.
TCS New York City Marathon
The largest marathon on earth. Five boroughs, five bridges, exposed wind on the spans, and a cool-but-deceptive November climate that misleads a 50,000-runner field on hydration.
Bank of America Chicago Marathon
The flattest, fastest World Marathon Major and a repeat world-record course. The flat profile invites aggressive pacing and fueling, and warm October years quietly turn a cool race into a sodium event.
Unbound Gravel 200
The defining gravel race in the world. 206 miles of Flint Hills gravel (the event billed as the 200), June heat and humidity, and long self-supported stretches between sparse checkpoints where the sodium deficit decides your day.
How Race Lab Works
One Page, Four Plans
Each race page links to our four free planning tools, pre-filled with that race's climate, distance, and terrain. You adjust your personal inputs; the plans render instantly.
- 01
Pick your race
Choose from LOTOJA, Boston, IRONMAN Kona, Leadville 100, or UTMB. Each page is calibrated to that race's conditions.
- 02
Open the tools
Sodium, carb, heat, and hydration tools auto-load with the race's typical climate, terrain, and finish target.
- 03
Adjust and execute
Tune your weight, target finish, and sweat profile. The plans regenerate. Save the printable card to your race kit bag.
Want A Plan Built From Your Real Training Data?
$15 unlocks a per-race plan with your measured sweat rate, course-specific sodium schedule, and post-race feedback capture. $79/year covers unlimited races. Free tools stay free, always.
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