Muscles Worked: Biceps, core muscles.

Starting Position: Stand with your feet shoulder width apart. Hold the dumbbells to your side with your palms facing away from you.

Action: Bend your elbows to curl one dumbbell up to your shoulder. Do not move the other dumbbell. Keep your palms facing up throughout the exercise. Return the dumbbell to the starting position. Repeat for the other arm.

Tips:

1.     One rep equals a curl on both arms.

2.     Avoid bending to the side when curling with one arm.