Slouching shoulders? DIY Elastic Shoulder Strap. Not a substitute for exercise but provides some support when sitting on chair etc. If you are not the workout type there is quite a simple exercise addressing both, stretching and strengthening; just turn your palms facing forwards for 10 minutes or more a day. You can do it while standing, sitting or lying down. After some daily practice you will see that your own body will be auto-correcting itself placing the scapulae where they should be.