HEALTH: The 20-Minute Workout

Gretchen Reynolds, the Phys Ed columnist, on the science of high-intensity interval training, or H.I.T., which scientists are finding can be as effective as longer endurance training.

Source: http://feeds.nytimes.com/click.phdo?i=94c6fdf7a780ef3e85d3c1a58eb70e91

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