10 Tone-Up Tweaks to Get a Better Burn

Not only do you need to switch up your routine every few months, Miller also suggests powering through an entire arm series without resting. "The idea is to work with a variety of moves that touches multiple areas of the same muscles and deplete these muscles to near exhaustion." There's also a bonus: By eliminating rest time your chances of injury decrease because in order to complete so many sets, you'll need to use a lighter weight.

Try doing one or two biceps movements, like a reverse curl (where the palms are face down holding dumbbells) or a hammer curl (palms face inward holding dumbbells). Without resting immediately go into two to three triceps exercises (such as bent-over triceps kickbacks or one-arm triceps dips). You'll not only tone more, you'll keep your heart rate up, torching more calories as you go.