You have to challenge yourself and your muscles. When you are really regimented, it's the same over and over and you start to get comfortable. Switching up the style of training works your muscles differently. (50 Cent)

You have to challenge yourself and your muscles. When you are really regimented, it's the same over and over and you start to get comfortable. Switching up the style of training works your muscles differently.

50 Cent

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