Most stability balls are made of polyvinyl chloride (PVC); ... Like the TheraBand ball, it comes with clear instructions, an inflation adapter, and a premarked measuring tape.

Weight balls and balance balls allow you to work your abs from different angles, explained Steve Stonehouse, an NASM-certified personal trainer and vice president of programming at Body Fit Training.

These stability ball exercises will tone up your core, legs, arms, and shoulders by challenging your balance and introducing rotational movements.

Stability balls are popular because they are so versatile. You can use them for a wide variety of exercises and a number of different positions. Position 1: Sit on the Fitness Ball.

Balance boards will actually make the exercise harder, as the sphere is much smaller than the round surface of the Bosu ball. I did a single-leg Bosu ball deadlift every day for a week — here ...