And we're going to go down to the floor for crunch ... If you have more than one medicine ball, you might find that you want a lighter one for some exercises and a heavier one for others.

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 ...

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

If you've ever seen people at the gym or the park jumping, hopping or hurling weighted balls to the ground, chances are they ...

However, most people tend to focus solely on traditional crunches, like sit-ups ... keeping your torso upright. Hold a medicine ball or weight with both hands and twist your torso to the right ...

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Let's start with a waist crunch. Have a seat on the exercise mat ... You can, for instance, hold onto a medicine ball -- or how about some weights as well? Again, you start with five repetitions ...