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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. I’ve been doing at ...

In the age of social media fitness challenges, trends come and go. Sometimes the strength training challenges take over; sometimes, pilates reigns. Something, cardio sessions rule the trend; sometimes ...

Sean Garner, trainer at Anatomy 1221 in Miami, Florida, challenges you to an easy-to-follow, but hard-as-hell workout that will put your cardiovascular conditioning to the test. Your goal is to row ...