This exercise will help train balance as well as leg strength.

1. Stand on the balance board with your feet evenly spaced. Engage your core and maintain perfect posture.

   

2. Sink your weight back onto your heels, bringing your hips backward while you raise your hands over your head to counterbalance your weight. Straighten your knees slowly, coming back up to the starting position. You can either hold this position for 10-30 seconds, as in a wall sit, or you can do 8-12 reps dynamically. Rest, then repeat the exercise as desired.