That's especially true for strength training machines. Each machine should actually tell you which specific muscles it's working. The better ones have a diagram to show you graphically what parts of your body are being worked.
That's less true for aerobic machines, though. There's always certain muscles that get worked more than others, but most aerobic machines work several groups at once, typically focusing mostly from the waist down. Some machines get the arms and chest involved, too.
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