Traditional weight machines have a stack of rectangular weight plates, each weighing 5 to 20 pounds. Each plate has a hole in it; to lift 50 pounds, you stick a metal pin in the hole of the weight plate marked 50. When you perform the exercise — by pushing or pulling on a set of handles or levers — the machine picks up the plate marked 50, plus all the plates above it. Weight-stack machines save time because changing the amount of weight you’re lifting is easier.
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