- Slow-Twitch Muscle Fibers (Type I) – These fibers allow for sustaining over long periods. i.e. sets with lower weight/higher reps, body weight exercises, and marathon running.
- Fitness-Twitch Muscle Fibers (Type II) – These fibers allow for greater force but fatigue easily. i.e. sets with higher weight/lower reps.
A person looking to put on size, or “mass-gaining” as it’s known, will often incorporate 5 sets of 5 repetitions, or 5 x 5 at a heavy weight.
On the other end of the spectrum a person looking to “cut”, or achieve more definition, will focus on say 3 sets of 15 – 20 repetitions at a lower weight.
Workout routines designed with these fibers in mind are almost sure sure to put you on the fast-track to gainsville.
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