(6-12 yrs.) Prerequisite: Swimming II or equivalent skill proficiency. Class emphasizes increasing endurance and independent swimming skills performance. Without assistance or flotation devices, students safely enter, exit, swim and tread water in deep water, tread water 15 seconds, push off in a streamlined position on front and back then flutter kick at least four body lengths. Skills also include rotary breathing, swimming front crawl, elementary backstroke and back crawl at least 15 yards.