Plank would tightens every muscle in your body

OK, I get it. You don’t have time to train your muscle, or even just the arm muscles. But guess what, you can still do it five minutes a day. I bet you’ve heard about the plank? This kind of workout is one of the most effective way to keep your arms sexy. It shapes not just the armpits, but also the whole body.

Plank is a practical exercise, why don't you try it to tighten your armpit muscles?
Plank is a practical exercise, why don’t you try it to tighten your armpit muscles?

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