That’s why it’s a popular yoga and strength-training move.

The idea is to alternate moderate-intensity cardio, like jogging, with intervals of fast, hard effort.

You know, the kind where your body hates you now, but thanks you later?

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“It’s safe and not intimidating,” says Cameron.

Walking

Sometimes, the simplest solutions are still the best.

Walking may be one of the least creative (and least strenuous!)

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Want to make it more challenging?

Up your paceor your incline.

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