Drop 5 system: 4 day mass building workout split. Blast your body with this potent muscle building workout by Steve Shaw. This four day plan is an upper/lower training split which cycles intensity over a 3 week period.

Drop 5 system: 4 day mass building workout split. Blast your body with this potent muscle building workout by Steve Shaw. This four day plan is an upper/lower training split which cycles intensity over a 3 week period.

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