. Although they can generate tremendous force, your fast-twitch muscle fibers fatigue quickly, which explains why you can sprint for only a short period of time.Why Your Muscles Shake While Working OutDuring a workout, your body recruits motor units in a systematic way. It first triggers slow-twitch motor units. As the exercise intensifies, moderate fast-twitch motor units begin to fire. Amp things up even more, and fast-twitch motor units jump aboard.
Muscle fibers tucker out at different times, so while some fibers are at work, others are dropping out and new ones are jumping in.
LIVESTRONG_COM The muscles freaking dance during plank!
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