If you're working to trade those batwings for biceps, try this simple upper arm toning exercise. Start with your feet shoulder-width apart, keep your back straight and hold your arms out at your sides so they are parallel with the floor. Slowly rotate your arms in small circles for 30 seconds; then reverse directions and continue for another 30 seconds. Looking for a little more intensity? Grab a pair of five-pound dumbbells and feel the burn.