This arm work out lets you also engage your core muscles while holding tight weight dumbbells. Lift both weights simultaneously while bending at the elbow and keep palms facing up. Repeat 3 sets of 10. This workout can also be used differently by turning palms inward toward each other for hammer curl.
Rear Delt Row
Start this work out on a balance ball with your arms extended directly in line with shoulders and holding light weight dumbbells. Lift right arm directly behind you bending and keeping elbow in until palm reaches your sides. Return to start, repeat with left arm. Start off doing 3 sets of 10 and increase through the weeks.