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Bosu Ball leg raise exercise – bent knee, to the side, single leg This exercise is great for the beginner who is working on core strength or an improvement in balance. Start by standing on the top of the Bosu with feet shoulder width apart. As you contract the core, put all your body weight on the left leg. Slowly lift the right leg to the side as high as possible by bending the knee. Lead with your knee and keep your foot flat. Once your right leg is lifted, slowly lower the leg to the Bosu. Repeat the movement with the same leg. Try not to pause after each repetition. Keep the core contracted, back flat and eyes facing forward. This exercise should not be completed quickly. Repeat the exercise with the other leg after you finish your set.