This one is very good for relaxing sore neck and shoulder muscles that have been strained by poor posture. First move your head slowly to the left, and hold it for a couple of seconds. Roll your head forward, looking down at your chest, until you are looking towards the right. Be careful not to make any sudden, jerky moves, which will strain your neck muscles further. Repeat this gentle rolling and stretching motion a few more times, until your neck muscles feel more relaxed.
Shoulder rolls are also effective remedies for muscles strained by incorrect posture.
Repeat the rolls, this time rotating your arms forward. Finish off by inhaling deeply, and shrugging your shoulders as high as you can, slowly and thoroughly. Relax, dropping your shoulders back to their natural level, and exhale fully. You may find that correcting your posture has other benefits, too. You may also start to have more energy, as you lose the fatigue brought on by slumping, and the feelings of anxiety connected with all-over tension.