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Best bicep improvement for a skinny 14-year old?
I'm a 14-year old guy, and I'm also skinny. My current routine is: 1) 20 mins treadmill (3-4 mp/h, incline 1.0)
2) 35 push-ups (sets of five with 3 min breaks in between)
3) 25 reps on each arm of ...