The shoulders can be complicated to figure out how to treat because they are THE most mobile part of your body. There are actually 4 joints that are part of the shoulder girdle, but we’ll keep things simple for our purposes.
Let’s think of the shoulders as the shelf for the head and the neck. If the shelf is angled, or tilted forward, the weight of the head and the neck will put extra strain on all the muscles that support that upper part of the body.