without a doubt, mine are my left and right body shots. Some guys call them shovel punches.
I work my arms until they're almost cramped. I take a rubber medicine ball (about 6-8pounds), cup it in my hand with either arm, and slam the thing off the gym wall while mimicking a punch as closely as possible. I also do this exercise for the right cross, almost like a shotput action, but straight out, and for uppercuts.
My trainer goes, "you hit harder than anybody in here." Yep, I'm training to be a brawler.

(Plus a couple really good HWs weren't there that day!

)
so trust me, try the Von Milash medicine ball slams for punching power. They work.
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