Changing the repetitions for your workouts will help recruit different muscle fibers from each movement. This is because we are all composed of “fast twitch” and “slow twitch” muscle fibers.
You are able to target slow twitch muscle fibers more when an exercise is performed in duration. When you do rep ranges in excess of 15 repetitions, you start to hit those fibers. On the other hand, performing lower repetitions where you are then able to lift heavier weight for fewer repetitions, you target more of the fast twitch muscle fibers.
Changing your repetitions from workout to workout, or even exercise to exercise will enable you to get more results. This is also the concept behind “periodization”.
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