This fast and effective upper-body circuit was designed by fitness expert and star of the "10 Pounds DOWN: Better Body Blast" DVD Jessica Smith to tone your arms and abs without any equipment! For best results, do the workout on two or three nonconsecutive days per week, alternating with cardio and lower-body exercises (and of course pairing it with a healthy diet).
How it works: Complete each set of exercises twice, moving quickly back and forth between the two moves, before moving on to the next set.
Set 1: Pushups and Planks
Set 2: Dips and Sits
Set 3: Side Press and Sweep
Set 4: Shoulder Pushup and Reclining Circle
Workout tip: There are a lot of pushups and pressing moves in this routine, so if you experience any wrist issues, try placing a folded towel under your palms or perform the move while holding onto a dumbbell—or modify in another way that works for you.