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 average pitching speed for an 11 year old is 52 mph. The median pitching speed for an 11 year old is 55 mph. The mode pitching speed for an 11 year old is 56 mph. The range of pitching speed for an 11 year old is 43 - 59 mph.