21S

Every FitnessVolt article tagged 21S, newest first.

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Latest on 21S

Training

Hardest Gym Exercises: The Ultimate Guide

Are your gym sessions starting to feel a bit lackluster? Truth is, sticking with the same exercises can lead to boredom and slow progress. This blog…

Cristian Fry ·
Muscle-Building

21s Workout: Not Just for Biceps!

It’s unclear who invented 21s, also known as the Matrix training system. Some attribute 21s to Dr. Ronald Laura, while others credit old-school English bodybuilder Wag Bennett,…

Patrick Dale, PT, ex-Marine ·