CxTx junction self mobilisation in standing (Cervicothoracic mobilization, with cervical retraction, standing)

Stand up straight and place your hands over the tops of your shoulders, close to your neck.
Your fingers should angle in towards your spine.
Pull forwards equally with both hands, and simultaneously retract your head, making a double chin.
As you relax your head a little, ease off with your hands.
Oscillate this movement rhythmically.