Holding still doesn’t seem like much of an exercise, but side planks are a great way to stabilize your core by strengthening the abdominal and back muscles. Dr . Brett McIff with the Utah Department of Health shows Mary how it's done.
Lie on the floor on your side, resting your elbow on the floor so it is directly under your shoulder. Make sure you are spreading your weight across your forearm, and don’t sag from your shoulder as you lift your hips making a straight line from shoulders to ankles. It will be tempting to rotate forward or back, but keep your body straight as you hold this position for 10-45 seconds, then repeat on the other side.