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.
According to the National Horseshoe Pitchers Association, the proper distance between horseshoe stakes is 40 feet. Stakes should stick out of the ground no more than 15 inches and no less than 14 inches, with a 3-inch lean toward each other, says the NHPA.