Squat down until the body is in the seated position, legs at 90 degrees, ensuring the backside does not drop below knee level and the knees do not protrude over the toes. Then extend the legs back to starting position being careful not to hyper extend the knee joint. At all times ensure you keep a natural curvature of the spine, the head and eyes looking naturally forward and place the hands across chest or on you hips for support.