STARTING POSITION:
Select the appropriate weight of the dumbbells. Sit down on a incline bench with back support with a dumbbell in each hand on either side of your hips. You should use a neutral grip. Your arms should be perpendicular to the floor. Press your head, upper back, and hips against the bench. Contract your pelvic floor and core.
MOVEMENT:
Contracting your biceps, fully bend your elbow supinating your hand while you exhale. Return to the starting position in a smooth movement while you inhale and alternate with the other arm.
TIPS: While your are doing the exercise, move only the elbow joint, make sure you don't move any other part of your body.