How to tread water and survive

Stand in shoulder-deep water; bend forward slightly at the waist. Extend your arms in front of your chest, elbows bent, palms touching, fingers held lightly together. Turning your thumbs down, push your hands away from each other and down slightly, until they’re shoulder-width apart. Turning thumbs up, pull your hands up slightly and back together.

Continue the sculling motion of the hands while adding a modified scissors kick performed upright. As soon as you finish one kick, start the next one; don’t pause between kicks. Or use a slow pedaling motion, bringing each knee slightly above walking level, then down again.