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Re:Ask HN: Is anyone successful with the 7-minute workout so... by patrickmay on Sunday February 16, 2014 @05:14PM (#7249592)
I would be astonished if 7 minutes per day provided even a measurable percentage of the benefits of exercising 5 hours per week (say 3.5 hours lifting and 3 30 minute runs).

Is there any evidence that it can?

Re:Ask HN: Is anyone successful with the 7-minute workout so... by pyoung on Sunday February 16, 2014 @10:58PM (#7250573)
The nytimes article listed in the parent, which is what sparked the 7-min workout craze, discusses and links to the study. I am not going to get into too much detail, but the general idea is that working a bunch of different muscle groups at high intensity for short periods gets you most of the benefits of longer endurance based workouts.