I lose my breath too early while free-style swimming. As a result I have to stop and take in a breath and then continue to swim again.
How do I train my body/mind to use minimum amount of oxygen under these conditions?
Breathe in deep each time (Duh) and then spend the rest of the time constantly exhaling. Do not HOLD your breath, slowly release it, (blow bubbles) for the next three strokes till it is time to breathe again.