HOW: Use a chair or stable surface to support your weight. Shift your body weight to one side as you bend the other knee and try to bring your heel up as high as you can using your hamstring muscles. Slowly lower it down...

HOW: Begin by placing your upper back on an elevated bench surface. Your shoulder blades should be just above the edge. Have your feet shoulder width apart and flat on the ground. Your knees bent with your feet slightly behind your knees. Push into...