Circuit 2, Exercise 3: Lateral Knee-Up Begin in a standing position, with your feet close together. Stagger your right foot slightly behind your left. Extend your right arm above your head. Lift your right foot, bending your knee and bringing it up to your side. Slightly crunch your torso down to touch your right elbow to your knee. Extend your arm and leg to return to the starting position. This counts as one rep. Repeat for 30 seconds, then switch sides. Image Source: Gold's Gym