Beth Skwarecki is Lifehacker’s Senior Health Editor, and holds certifications as a personal trainer and weightlifting coach. She has been writing about health for over 10 years. Machines are one of ...
You're currently following this author! Want to unfollow? Unsubscribe via the link in your email. Forget the treadmill — if you only use gym machines for cardio, you're missing out on some serious ...
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