In Accordance to USA Swimming, the appropriate quantity of shoulder rotation is slightly below 30 degrees from the surface of the water. Make certain you do not rotate an excessive quantity of, as this will harm the efficiency of your stroke. The appropriate body place for backstroke is to be nearly parallel with the floor of the water, with your legs pointing slightly downward to the... https://www.4shared.com/office/uDuDvx5qku/Aquatic_Vs__Landbased_Therapy_.html