Answer:
Endurance exercise uses slow-twitch muscle fibers. When you do aerobic endurance activities -- think long-distance running, cycling and swimming you're relying on slow-twitch muscles. They're more efficient at using oxygen to generate ATP, the energy our cells use to operate.
People have two general types of skeletal muscle fibers: slow-twitch (type I) and fast-twitch (type II). Slow-twitch muscles help enable long-endurance feats such as distance running, while fast-twitch muscles fatigue faster but are used in powerful bursts of movements like sprinting.
Explanation:
Not sure if this will help but...maybe
