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A member asked:

Why is it said that to build more muscles you have to lift heavier by activating fast twitch fibers? i only get the pump with light weights.

A doctor has provided 1 answer
Dr. Felix Brizuela answered

Specializes in Neurology

Strength: fast twitch fibers are involved with strength, slow twitch with endurance, so the former tend to grow in size and volume.

Dr Machanic and another doctor agreed

Answered 11/28/2017

1.2k views

Thank

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