A staple of many core workouts, most runners will be familiar with the side plank exercise. But you may be surprised to learn that it's one of the best exercises you can do for working your deep core.

Start in the side plank position on your side with your elbow ... Think of this as a full core move that gets the whole unit involved. Start in a half-kneeling stance, slightly wider than usual.

It hurts, and time seems to run at half speed when you’re holding one ... Lower your right leg and raise your left leg. Side Plank: Lie on your left side with your knees straight and prop ...