Inside ‘Rational Fitness,’ the Common Sense Approach to Exercise

The rules are simple: First off, there are no rules.

The idea of rational fitness emphasizes exercising to feel good over focusing on calories and rigid rules.

Anna Maltby, director of health and wellness at Refinery29, explained further, telling ABC News correspondent Mara Schiavocampo, "It's basically the common sense way to exercise. So you're taking guilt and shame out of the equation ...we're not punishing ourselves, we're not counting calories," she said.

The goal is to encourage people to do activities that they enjoy, she said. If you hate running, don’t run. Do something else – Pilates, weightlifting or another activity that feels good.

"It's about focusing on the wonderful things that exercise does for you so it makes you healthier, it helps you sleep, it gives you less pain, and puts you in a better mood ... and makes you live longer," Maltby said.

The rules are simple: First off, there are no rules. Any way you move your body counts – whether it’s throwing a Frisbee, throwing a ball around or anything else that makes you feel good.

And one more thing: Put a towel over the calorie counter on gym machines and do what feels right.

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