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.
14
Races covered
5
Free tools wired
No
Email required
Yes
Brand-neutral
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. 110 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.
Western States 100
The original 100-mile trail race. Cold high country at dawn, then canyons that regularly reach 100F, a river crossing at mile 78, and a 30-hour cutoff from Olympic Valley to Auburn.
Badwater 135
135 miles from Badwater Basin, 280 feet below sea level, to Whitney Portal at about 8,300 feet. July in Death Valley, three mountain ranges, no official aid stations, and a 45-hour limit.
IRONMAN Texas
The IRONMAN North American Championship in The Woodlands. A flat, fast bike on the Hardy Toll Road and a rolling run along the Waterway, set in late-April Gulf Coast heat and humidity where the run decides the day.
Honolulu Marathon
A December marathon that starts at 5 AM in the dark and finishes in tropical sun. Downtown, Waikiki, Diamond Head twice and an out-and-back to Hawaii Kai, in heat and humidity most of the field has not trained in.
Javelina Jundred
100 miles of Sonoran desert loops in McDowell Mountain Regional Park on Halloween weekend. Five laps of rolling trail, costumes everywhere, afternoon highs in the 80s or 90s, and a cold desert night before the 30-hour cutoff.
St. George Marathon
A net-downhill Boston qualifier from the Pine Valley Mountains to St. George. A cold mountain start, the Veyo climb near mile 8, then about 2,500 feet of descent into a dry desert finish that warms quickly.
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.
Pick your race
Choose from LOTOJA, Boston, IRONMAN Kona, Leadville 100, or UTMB. Each page is calibrated to that race's conditions.
Open the tools
Sodium, carb, heat, and hydration tools auto-load with the race's typical climate, terrain, and finish target.
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?
Add your email and a per-race plan unlocks: your measured sweat rate and a course-specific sodium schedule. Every race, no charge. Free tools stay free, always.
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