The pushdown is the go-to triceps isolation exercise — constant cable tension makes it a reliable builder for the back of the arms.
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Get FormTwin — free on the App StorePushdowns isolate the triceps — the three-headed muscle that makes up most of your upper-arm size. The rope variation lets you spread the hands at the bottom for a stronger contraction.
The triceps are about two-thirds of your upper-arm size, so training them well matters more than curls for overall arm size. Pushdowns are a great isolation move alongside pressing.
A straight bar lets you load a bit heavier; the rope allows a wider spread and a stronger squeeze at the bottom. Rotating between them covers the triceps well.
This guide is general fitness information, not medical advice. Muscle involvement varies with form, grip and individual anatomy. Consult a professional before starting a new program.