Muscles Used in the Backstroke. Even though you're swimming on your back, you use your abdominals in addition to the muscles of your back -- the latissimus dorsi and spinus erectors -- to support you as you flow through the water during the backstroke.
The average distance for a pitching wedge is 130 to 135 yards; for a sand wedge 115 to 120 yards; and for lob wedges 75 to 95 yards.
The Bullet Ball, which is sized just like a standard nine-inch baseball, accurately measures velocities up to 120 miles per hour and adjusts to distances from 46 to 60 feet, six inches. It's an ideal pitching trainer for any age or skill level and allows pitchers to accurately measure and improve ball speed.