Now take off the fins, and build up your kick strength slowly and sensibly. To increase the difficulty, keep your hands out of the water, or even hoist them above your head. Try vertical dolphin kick. These swimmers tend to turn their head far beyond the point that's necessary to draw a breath. Of course it's completely natural to go through an acclimation phase in the water, but over time you should strive to turn your head only as much as is necessary to get your mouth above the surface of the water.
Any further motion is a waste of time and energy.
We're not talking about reckless driving here, but sound freestyle technique. When the hand pulls this far across the body, the arm, shoulder and back are not able to pull as powerfully as if the hand stays on it's own side of the center line. For maximum power, distance per stroke and speed, don't let that hand veer off course. Try to keep your chin at water level and your gaze focused straight ahead. You'll soon realize how fast you need to move your arms to maintain this upright head position.