Switch up your arm routine to get bigger arms in just a few weeks. 
9 of 10    Narrow-width Pushups
Hammer your triceps, pecs, shoulders, and core by using a narrow width on the pushup. Get into a pushup position with your hands only a few inches apart. Lower yourself by keeping your elbows close to your sides. To make this exercise harder, elevate your feet or throw on a weight vest.

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