Is There a Magical Rep Range for Hypertrophy?

You mustn't get stuck in a dogmatic routine following an arbitrary rep count simply because that's what you've always thought was best.

Most people are somewhat familiar with the association between exercise reps ranges and their targeted effect on the body during resistance training. The heaviest load one can lift at a given weight correlates with maximal strength, while anything one can do above 20 times or more clearly signifies muscular endurance. 

 

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source https://breakingmuscle.com/fitness/is-there-a-magical-rep-range-for-hypertrophy