Lie back on a flat bench gripping one dumbbell tight on your right hand
Keep the chest up and press the shoulder blades against the bench
Keep your elbows, fully extended and take a deep breath
Lower the dumbbell in a controlled manner till the dumbbells come to the side of the chest
Keep the elbows at a 45 degree angle with the torso and push the dumbbell back up
After finishing the set on right side, repeat the same with the left hand