Does high-intensity exercise affect our hearts? minds? life spans? waistlines?

For the past five years or so, high-intensity interval training, or HIIT, has been one of the most popular and controversial forms of exercise. Consisting of brief spurts of intense exercise interspersed with rest, various versions of HIIT have been tested, tried, talked about and sometimes derided by countless researchers, coaches, journalists, influencers and almost anyone else interested in fitness.

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