Stand with your feet hip-width apart and with a slight bend in your knees. Hold a dumbbell in each hand, palms facing out. Let the dumbbells rest by your sides. Roll your shoulder blades back and down your spine. This is your starting position.
Keeping your elbows close to your sides, slowly raise the dumbbells up to your shoulders.
Moving with control, bring the weights back down to your sides.
Bringing the weights a few inches away from your sides and keeping your elbows tucked in, raise the dumbbells out wide and to your shoulders.
Lower the weights back down close to your sides with control.
This counts as one rep. Alternate between narrow and wide bicep curls for one minute straight.