When you work out at a moderate intensity, like walking briskly or running at a steady pace for longer periods of time, you’re primarily activating muscle fibers called type 1 or slow-twitch muscle fibers. These muscle fibers are designed for endurance exercise of longer duration.
On the other hand, when you pick up the pace and work out, like in AfterBurn, at an intensity where you can’t string together a full sentence because you’re breathing so hard – you activate a second type of muscle fiber called fast-twitch muscle fibers. These fibers are designed for strength building and higher intensity exercise. These are the muscles sprinters use when they take off across a field.
Interestingly, long distance runners who maintain a slower, more sustained pace for longer periods of time have a higher percentage of body fat than sprinters even though they look thinner. Sprinters look lean, but they have more developed musculature, because they use more fast-twitch muscle fibers.
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