The purpose of the study was (1) to determine if core musculature strength gains were better with floor exercises or physioball exercises and (2) to determine if the number of non-contact lower extremity injuries would decrease with stronger core musculature in varsity women's volleyball and varsity women's and men's basketball players. Over 8 weeks of summer workouts, 20 female intercollegiate volleyball, 9 female and 16 male intercollegiate basketball...