Medicine balls are a great alternative for dumbbells or barbells, or you can use them in tandem with free weights.

All right, guys, we are going to do a 10 minute medicine ... ball to your toes. Remember, hold it for a second. You should definitely feel that heart beating pretty good. Just one more exercise ...

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This makes ab workouts with a medicine ball more effective at burning calories and engaging your core than if you did the same workouts without one. There's no fitness baseline you need to work ...