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.
Of course, not every field is constructed exactly the same. Fields all across the world differ in terms of distances of baselines, outfield fences, and the pitching rubber. In the official rules of the International Softball Federation, the maximum outfield distance is stated to be 250 feet.