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.
RECOMMENDED AREA Ground space is 1.2 acres minimum. SIZE AND DIMENSION: Baselines are 60'. Pitching distance is 46'. Pitcher's plate is 6 above the level of home plate. Distance down foul line is 200'. Outfield distance to pocket in center field is 200' to 250' optional. ORIENTATION: Optimum orientation is to locate home plate so that the pitcher is throwing across the sun and the batter is not facing it.