Add Yahoo as a preferred source to see more of our stories on Google. There’s no greater hallmark of fitness than a six-pack, which is why there’s typically no shortage of crunches and leg raises in ...

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. This is a great ...

Your core moves in many ways. A physical therapist explains the importance of training rotation, how often to train it, and ...

When you talk about strengthening your core, you’re probably thinking about your abs. In particular, you may be focusing on your rectus abdominus (that’s the six-pack muscle). The rectus abdominus ...