CTS Ultrarunning coach Johnny Fitzgerald breaks down why knowing your sweat volume and concentration in your sweat can help you improve your running from avoiding cramps, to digesting carbohydrates better, to relative energy levels. We also discuss how Jeff Mogavero won a golden ticket at Javelina Jundred knowing his sodium concentration of nearly 2,000mg.

Now Jeff will be running at Western States with Jim Walmsley, Kilian Jornet, Hayden Hawks, David Roche, and more.

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Watch our Black Canyon 100k Recap with Jeff Garmire

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