Mass Made Simple

Using the physics of heat and water to study the thermal ecology of animals and plants in the wild.

These are the first-ever videos to identify the key movements and rhythms that link the two long-axis strokes (freestyle and backstroke) and those that unify the two short-axis strokes (breaststroke and butterfly). This unique approach – learning the essentials of two strokes at once – cuts learning time significantly and produces improvement with unprecedented ease and speed. We guarantee it will prove to be one of the most valuable swim-improvement tools you can own.