Originally Posted by
BikeWNC
Do you stretch your pectoral muscles? Riding a bike for long distances often in a similar position for long stretches can tighten these muscles and cause the shoulders to roll inwards. That can put traction on other muscles and cause all kinds of spasm. I know I suffer from tight pecs and need to work on getting them to relax or at least back to a more neutral position.
Basketball players get the same thing because they are always pushing the ball forward when they pass. They need to stretch the pecs and tighten up the back muscles. If someone looks at you from the side and your shoulders are bent forward then this is a problem.