I just learned that one of my favorite ways to pass the time in a hotel gym has been given a catchy name and a celebrity endorsement. It’s the 15-15-15 workout, and it will give you a good 45-minute ...

Not feeling like hitting the gym today? No problem! All you need is a yoga mat and 20 minutes to strengthen your core—no crunches required. Part of the Women's Health Ultimate Abs Challenge, this ...

Instructions: After the warmup, perform the four exercises for 40 seconds each to complete one set. Rest for 20 seconds between each set. Repeat for a total of four sets. Today’s workout is all ...