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 typical distance between the bases for a softball field is 60 feet. The distance from Pitchers Mound to Home Plate vary by age and type of softball field also. For adult slow pitch this distance can range from 35 to 53 feet. Typically the Grass Line is 60 feet in a semi-circle in circumference from the Pitchers Mound (rubber).