Runners hear the terms aerobic and anaerobic thrown around, but understanding the difference between the two can change how you approach your workouts. Together, these energy systems form the backbone ...

Contained in our Beginner Training Schedule is a system for quantifying how much aerobic work you're doing and, especially for those new to multisport, giving one an idea of work equivalency. Race ...

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Tennis is a high demand sport which requires a comprehensive blend of technique, agility, speed, and aerobic conditioning interspersed with explosive power. To play tennis the body needs fuel from two ...

Fitness doesn’t stick with you forever, nor does it magically disappear all at once. But your absolute top gear is usually the first thing to go when your training stalls. Coming back after a two-week ...

ATP (or adenosine triphosphate) is our muscles’ energy currency, and there are three bioenergetic systems that produce ATP for climbing. Given that most boulder problems (or attempts) last between a ...

This article is the final in a series of four. Read articles one, two, and three to get up to speed. Over the course of this series I discussed all manners of training, from learning about our bodies’ ...

Any exercise you do requires two things: muscle contraction and energy. You train your muscles with exercise, of course, but did you know you also train the mechanisms that provide the energy? All ...