Calories used while swimming for 30 minutes type of stroke 56-kg woman 77-kg man backstroke 95 130 breaststroke 91 125 fast crawl 87 120 slow crawl 95 130 sidestroke 68 90 treading water 35 48 table 2-1 which variable mentioned in table 2-1 is kept constant? a. amount of time spent swimming b. type of swimming stroke c. number of calories used d. the person swimming