Prerequisite: Experienced swimmers who have completed Stroke Mechanics II, can tread water for one minute and swim continuously at least 150 yards freestyle, 100 yards backstroke, 50 yards breaststroke, and 25 yards butterfly. Students must wear a one-piece, competitive-style swim suit and goggles. Students with long hair are required to wear a swim cap. Class emphasizes increasing swimming endurance and distances through interval training and pace clock use and further refines swim strokes, starts and turns. Individual Medley (IM) is introduced and practiced.