Click the links for how-to videos. Physioball crunches: Lie on your back on a physioball with feet on the floor, knees bent at 90 degrees. Put your hands behind your head and tighten your abs as ...

Click links below for how-to videos. Chest fly on physioball: Lie on your back on the physioball with your head and neck on the ball. Keep your hips up and squeeze your glutes. Holding free ...

Why and how it helps: The back part of your lower body is often undertrained, according to Wilson, who recommends leg curls on a physioball as one way to strengthen the area. The exercise develops ...

I’m sure that you’ve seen someone doing anything from squats to chest presses on a Bosu Ball, Physioball or any type of unstable device. Maybe that person is you. Instability has become a ...