Quick post on this which I will update at a later date…
Take a muscle relaxant like Magnesium glycinate
All magnesium is good for relaxing tense muscles, but glycinate is the only form which won’t give you the trots in high doses. It can make you sleepy, so take it in the evenings.
Stretch your Chest
The easiest way to stretch your chest is against a door frame, take a look at the video below for some ideas
Maintain or increase your range of movement with band exercises. You use it or lose it with flexibility.
Rear Delt Flyes
Perform slowly with a squeeze and hold at the top of the movement
Invest in a Foam Roller
Lacrosse or cricket balls are good too for getting into particularly tight spots.
Hip Flexor Stretches
If you have hunched shoulders, there is a good chance that you have tight hip flexors and a titled pelvis from sitting down all day.
Make sure to stretch your hip flexors every day!
The reverse hyper machine is also excellent for correcting poor posture. It decompresses the spine and promotes blood supply to the lower back. The motion of extending the hips is also good for poor posture which results from sitting down all day.