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.
If your distance with your pitching wedge 120 yards and your distance with your sand wedge 85 yards, you have a problem. You will have to try to finesse shots that require a distance between 85 to 120 yards. Read more on... gap wedges.