Less time doesn’t mean less effort. In fact, it means exactly the opposite. To reap the true health benefits from a 20-minute workout, you will need to push yourself further than you are accustomed during a standard workout. The best way to do this is through HIIT training.
“You have to get your intensity up to a certain degree that will cause a disturbance in the nervous system,” Hoebel says. “When you do normal workouts your body does not need to turn on the turbo charge, but when you ask the body to do HIIT training with that type of intensity, the body’s like ‘OK we’re not running on our normal gas tank.’”
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You shouldn’t feel comfortable during the workout. Hoebel says a good effort indicator is whether or not you can carry on a conversation. If you’re doing it right, you shouldn’t even want to talk with anyone.