Target your core and strengthen your upper body at the same time with this 2-in-1 move. Be sure to keep your shoulders over your wrists and your hips at shoulder height throughout the exercise to get maximum benefit.
1. Begin in plank position, which is just like the top of a pushup with your hands directly below your shoulders and your legs straight, up on your toes. Inhale and shift your weight to your right foot and raise your left foot off the mat.
2. Exhale, contract your abdominals and round your spine as you bring your left knee toward your right elbow. Keep your hips low and shoulders above your hands. Round your upper spine toward the ceiling as much as you can. Pause for two breaths, then return to plank position and repeat with the other leg.
Voight is the creator of a line of fitness DVDs, including "Full Body Stretch" and "Ballet BodySculpt."