Here is David demonstrating the pectoral stretch using the door frame. Incredibly effective stretch to again assist the posture and reduce the effect of rounded shoulders. Make sure when your elbows are against the door frame, ear must be in line with shoulders and step into the door frame, as if to do a lunge.
Give it a try and remember for any stretch to be effective hold it for 15 seconds. If your hands are higher up on door frame you will be stretching the lower pectoral muscles and if the hands are lower you will be stretching the upper fibers of the pectoral muscles.
Yours in Healthcare
CostaSpine