Instructions:

1. Lie flat on a bench with your head at one end and your feet on the floor.
2. Hold a dumbbell with both hands and extend your arms straight above your chest.
3. Keeping a slight bend in your elbows, slowly lower the dumbbell behind your head until you feel a stretch in your chest and shoulders.
4. Pause for a moment, then raise the dumbbell back to the starting position.
5. Repeat for the desired number of repetitions.