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Shows how to choose the most effective and enjoyable method of keeping fit. Explores all the alternate paths to fitness such as running, swimming, bicycling, walking, calisthenics and sports. Provides a wealth of guidance on basic exercises, with lots of tests and charts to help set up an individualized exercise program. Outlines an aerobic point system for precise self-assessment of requirements and progress.

A piece of history written in his own words in a letter to his daughter.