Warm-up 7 min swim 6 x 50 kick on 1:00 6 x 50 Lung Busters on 1:00 (5 breaths, subtract 1 per 50) Main Set 4 x 2 x 50 Stroke on 1:15 easy 150 Sprint on 2:15 10 x 50 Sprint on 1:00 Warm-down 4 x 50 Easy on :40, :50, 1:00, 1:10