One-minute high-intensity exercise (3 x 20 sec), 3x a week for 12...

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One-minute high-intensity exercise (3 x 20 sec), 3x a week for 12 weeks, improved fitness as much as did 3 x 45 minutes a week aerobic training.

Muscle mitochondria also increased similarly in both.

Intensity trumps volume.

You don't need a lot of time to get fit.
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