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Originally posted by Becca
You are extending your arm under tention while lowering yourself. Assuming you are doing them correctly, that is. If you just let yourself fall back down you aren't, but you will hurt yourself doing this.
No, this doesn't hit the triceps primarily. It's eccentric contraction so it hits the same muscles as you use going up, with is primarily the biceps and the triceps help a bit.
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I take it you have never done arm curles with free weights? How about military press? Single arm extentions over the head? All of those, pluss many more, work the biseps very well.
Yeah, an arm curl does. A military press works the triceps because it's extending the arm.