STARTING POSITION:
Select the appropriate weight of the dumbbells. Stand straight with a dumbbell in each hand on either side of your hips. You should use a neutral grip. Contract your pelvic floor and core while keeping your chest up. Lift the right dumbbell just in front of you. Your thumb should point upwards.
MOVEMENT:
Open your right arm and pronate your hand. The thumb now should point to the floor. Move your hand towards your right hip in a smooth movement. Repeat the movement for the specified amount of repetitions, then switch sides and repeat the exercise.
TIPS: While your are doing the exercise, move only the arms, make sure you don't move any other part of your body. The exercise key is quality over quantity. The trick is to perform the exercise using proper form.