Cut The Fluff

You may be able to build bigger biceps with fewer arm curls, report Norwegian scientists. But squat more for stronger legs. In the study, novice lifters who performed three sets of each lower-body exercise built nearly twice as much leg muscle as beginners doing only one set per move. However, for their chest and arms, a single set worked just as well. The researchers speculate that leg muscles require multiple sets, since you condition your lower half with everyday activities.