I grant you it was a study of just 24 healthy 42yo overweight men (body mass index greater than 27), one third of whom were randomized to a single 4 minute bout of high intensity interval exercise three times weekly for 10wks while another third were randomized to 4 episodes of high intensity interval exercise, each lasting 4 minutes w/another 3min of active rest between each set. This group was also expected to practice this 25min session 3x/wk for 10wks. The control group did not participate in any of these exercise sessions.
Bottom line: just under 15min/wk of high intensity interval training was similar to 25min/wk in terms of improving VO2max, body composition, high blood pressure, etc. So no more excuses now!
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