Curls work the biceps ( front of the upper arm) and forearm.
Stand with dumbbells in both hands, palms facing forward, elbows tucked into your waist. Bend your elbows and bring the dumbbells up to your shoulders. Slowly lower. Make sure you don't lock your elbows.
Do 16 reps, rest and repeat.
Photograph: Carlo Allegri/Getty Images
Also read: A fantastic fitness regime for 2008!