Stew Smith (http://www.stewsmithfitness.com) and Jeff Nichols (https://www.performancefirstus.com) discuss hypoxic training in the pool, at altitude, while running, lifting and other activities.

The physiology and training options behind hypoxic workouts can be helpful if you do it correctly and safely (not by yourself). Try out some of these classics:

Hypoxic Swim Pyramid: (FREESTYLE)

100m at 2 strokes / breath

100m at 4 strokes/ breath

100m at 6 strokes / breath

100m at 8 strokes/ breath

100m at 10 strokes / breath

100m at 12 strokes/ breath....or return back down the pyramid to get about 1000m worth of swimming

Swim 50-50 free / css workout

Repeat 10 times

-Swim 50m freestyle at 6-8 strokes per breath OR underwater dolphin kick with fins

-Swim 50m CSS at goal pace OR turtleback 25m (flutterkicking on back - nose breathing)

Over / Unders:

Repeat 10 times

-Swim 25m underwater dolphin kick with fins

-Swim 25m turtleback 25m (flutterkicking on back - nose breathing)

Check out other videos of combat swimmer stroke, workouts, and other spec ops related training. See http://www.stewsmithfitness.com for more information about military, law enforcement, special ops, fire fighting training programs.