A triathlon is a multiple-stage competition involving the completion of three continuous and sequential endurance disciplines. While many variations of the sport exist, triathlon, in its most popular form, involves swimming, cycling, and running in immediate succession over various distances.

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Does a runner automatically slow down when your body's water content is lower than normal?

Please ignore dehydration issues. Is there any evidence or does anyone know if losing water without replacing it will make you slow down? I was shocked to see that I lost about 5 lbs of water weight ...