Bridge on BOSU Lie flat on your back on a mat with heels on the BOSU and knees bent, with your arms at your sides. Feet should be hip distance apart. Slowly raise your pelvis up toward the ceiling to a point where your knees, hips, and shoulders are in one line. At the top of the movement, be sure to really squeeze your glutes while you hold the position for five seconds. Now slowly return to the start position to complete one rep. Image Source: POPSUGAR Studios