Add Yahoo as a preferred source to see more of our stories on Google. Credit: Getty Images GHD sit-ups are the type of advanced abs exercise reserved for those in the gym who like to send their core ...

Robert Garay had no reason to suspect that a Crossfit workout would lead to a trip to the ER - but it did. The 37-year-old real estate agent had been doing Crossfit for a year when he completed a ...

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. It’s kind of strange, ...