Want toned upper arms like Michelle Obama? ACE says the best way to reduce "jiggle" is to strengthen your triceps (the muscles located in the backs of your upper arms).
1. Triangle Push Up - A variation of the traditional push-up, the triangle push-up involves placing your thumbs and forefingers together with your hands directly underneath your chest, so someone looking at you head-on would see your head and elbows forming a triangle. If you're new to push-ups, you can do them with knees on the floor until you build up your strength. ACE has instructions here.
2. Dips - These can be done in the gym using dip bars or a weight bench, or at home using a sturdy chair, which you sit on. Begin by placing your hands on either side of your hips then, with with your feet together, extend your legs out in front of you. Carefully move your buttocks off the bench, while leaving your hands in place, and lower your hips toward the floor until your upper arms are parallel to the floor, then push back up using your hands (not your legs). ACE has detailed instructions here.
3. Triceps Kickback - You can use dumbbells or even large cans of food for this exercise, which involves lifting weights behind your back. As with all of these exercises, proper form with the triceps kickback is so important to avoid injury. For detailed instructions on this and all of the above exercises, visit ACEfitness.org.