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Longevity: High-intensity interval training for aging and unfit people

Its a fitness promise that sounds too good to be true: you exercise just a few minutes a week, and reap the health benefits of much longer workouts. It's called high-intensity interval training. Many older and unfit adults are wondering if this all-out approach is just a heart attack waiting to happen. For a look at new research on the effectiveness and safety of so-called HIIT training, Doug Dirks was joined by longevity columnist Sharon Basaraba.

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