Are you looking to kick off a new fitness routine or simply make yours a little better? Our 60 Seconds To Fit video series is here to help. "Each exercise targets multiple muscle groups," says celeb trainer Sadie Kurzban. This short clip breaks down exactly how to do side planks with oblique twists. This move will strengthen and tone your entire core, but it especially works your obliques. It doesn't require any equipment, so you can do it nearly anywhere. Remember to plant your hand directly under your shoulder, and feel free to try out both variations, to see which one works best for you.