This killer medicine ball workout mixes cardio and resistance moves to help you build strength and blast fat—all while sculpting a tighter torso and flatter abs. A weighted ball is a great training tool because you can add it to almost any exercise to challenge your core stability and improve coordination. For best results, do this workout on two or three nonconsecutive days per week.
You'll need: A medicine ball (3-10 lbs)
Workout details: Do each move as quickly as you can with good form, moving from one exercise to the next with little or no rest in between. Once you've finished the last move, rest and repeat the entire circuit 1 or 2 more times.