In this drill, you start kicking on your side, with your top arm at your side, your bottom arm extended palm-down towards the bottom of the pool.

Stay in this pose for 30 seconds to 1 minute. Inhale to come up, strongly pressing the back heel into the floor and reaching the top arm toward the ceiling.

It sounds amusing, but not if you have a large green brain and go "Ack" a lot.Stay away or arm yourself with really top-level shielding.