Kettlebells can help you gain muscle and cardio fitness at the same time. Here's what to know, according to a world-record athlete.

Kettlebells can help you gain muscle and cardio fitness at the same time. Here's what to know, according to a world-record athlete.

Courtesy of Jennifer Hintenberger

If you're not using kettlebells in your workouts, you might miss out on major gains.

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