We decided the answer was three repeats. We set our three repeats into a workout that lasted ten minutes, from start to finish. So a two-minute warm-up followed by a twenty-second sprint, repeated three times and followed by a three-minute cool-down. We had a group of subjects repeat the One-Minute Workout three times a week for six weeks. Our study also was more involved than Metcalfe’s previous twenty-second studies, as we included additional measurements like muscle biopsies to examine changes in the subjects’s muscles. The key findings were a 12 percent increase in cardiorespiratory
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