MUSCLES ENGAGED Obliques Many people put a lot of focus on working their abs but forget their surrounding neighbors; the oblique muscles. Obliques serve as stabilizers, and are used in almost every physical activity. Exercising your obliques should be a very important part of your workout program. Back (middle) Middle back muscles are very important as they help to support and strengthen the core muscles at the front of your body. Equipment Used Bosu The BOSU balance trainer stands for "Both Sides Utilized" and is most often used for balance training, various athletic drills and aerobic activities. Exercise Instructions Step 1 Start in a push up position on the Bosu making sure that your shoulders are in line with your wrists, your head is up and that your lower back stays straight. Step 2 Keeping your hips down and your head up, bring your knee as high up as you can to your elbow, contracting your obliques throughout the motion. Step 3 Leg to the starting position, alternate legs and repeat action.