Dumbbell pullover

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