"Everybody has a gorgeous set of triceps and abs," Greene says. "The trouble is that in some people, they're hidden under body fat."

You can do triceps extensions all day long, Greene says, but nothing's going to happen unless you also lose body fat. "There's no such thing as spot-reducing," he says. "You can't tell your body to draw energy only from the fat on your arms and nowhere else. Great results come from trimming fat as you train muscles."