Finding an exercise that gets you more bang for your buck is like hitting a jackpot, and if it's bodyweight—AKA requiring no equipment other than your body—you're onto a winner. One exercise we love ...

A plank is more difficult than it looks. You have to use all of your muscle groups, including your core, abs, arms, back, shoulders, glutes and legs. It’s normal to struggle to do a plank. Many of my ...