How to do it: Stand holding a dumbbell in each hand with your palms facing in and your arms straight by your sides [A]. Bend your elbows and lift the weights up toward your shoulders, keeping your palms facing inward throughout and your elbows tight to your sides [B]. Straighten your arms and press the weights up until your arms are fully extended. Reverse the move and come back to the starting position.
Top tip: During the curl, keep your elbows close to your body. Don't rock back and forth as you perform each repetition.