As part of the Women’s Health Flex Challenge, trainer Jenna de León takes you through this snappy circuit that includes four ...

Your core (that means both your back and abdominal muscles) is your source of power—seriously. It's also what helps stabilize your entire body, prevent low back pain, and impact your posture, helping ...

Training abs isn't usually hardas in, the exercises aren't particularly difficult to perform, once you learn the form. Many moves start unloaded, and you can get some good work in without needing to ...

I’m training for a half marathon, so I’ve been pretty religious about getting in three to four runs per week over the past few months. But with all that running taking up my time, I knew I was ...