WU: Swim 500m stroke of your choice. 75 m free style hypoxic pyramid: 1x 75m @ 1 breath every 2 strokes, 1x 75m @ 1 breath every 4 strokes, 1x 75m @ 1 breath every 6 strokes, 1x 75m @ 1 breath every 8 strokes, 1x 75m @ 1 breath every 10 strokes. Then work your way back down to 1 breath every 2 strokes. Rest as needed between sprints. Cool down = 1000m CSS with fins.
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