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.
A gap wedge's angle varies between 50 and 54 degrees. The pitching wedge is usually around 45 degrees while the sand wedge is between 54 and 58 degrees. Golf club makers have decreased pitching wedge loft degrees over recent years, with the gap wedge becoming an option for golfers.