04 · The numbers
Where does your race fall apart?
Every one of these has a number behind it, and every one of them breaks a half marathon the same way it breaks a hundred miler. Pick the problem that keeps finding you, get the fix, and get the test that makes it yours instead of a guess.
Race day
I hit the wall
The wall is not a fitness failure. It is running out of carbs because your gut was never trained to take in more. It arrives at mile 20 of a marathon and mile 60 of a hundred for the same reason. Your legs did not quit on you. Your fueling plan did.
The tests
Six problems, four tests. Here is what each one measures, what it costs, and where to book one near you.
1,500
mg sodium per liter, and 40 oz of fluid lost per hour
My result
How much fluid and sodium you lose per hour, so you can replace it
Two runners can lose the same fluid and need four times the sodium. Guessing here is why people cramp, bonk, and finish races in a medical tent.
Typical cost
$0 for the weigh-in version, $150 to $250 for a lab sodium test
Where to get it
Precision Fuel & Hydration →
Advanced Sweat Test, the category standard, plus a free online fuel planner
$150 to $200 in person, planner freeNationwideLevelen →
Mail-in sweat collection kit, results by email
About $150Mail-in kitThe weigh-in protocol →
Scale before, scale after, one hour at race pace. Gets you fluid loss for free
FreeDo it yourself
Train like it's programmed. Because it is.
Everything on this page is already built into the training I write. Bring the goal, I bring the system.
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