According a group of scientists in Canada, 30min of exercise 5x a week no longer necessary for "overall good health". All that is needed is to follow a routine involving "one minute of strenuous effort, at about 90 percent of a person’s maximum heart rate, followed by one minute of easy recovery. The effort and recovery are repeated 10 times, for a total of 20 minutes." That's it. 20 minutes a day. it is recommended to perform this "perhaps twice a week." There you have it.
Someone should tell Sergio (UCSD Triathlon coach). We've been done 20 x 1 min every Monday on our bike trainers (super high resistance / low cadence). We are clearly running a high risk of becoming "too healthy".
NYT article link
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