Chest stretches are important for the mobility of the shoulder joint. The exercise strengthens and stretches the chest muscles, the front part of the deltoid muscle, and the internal rotators of the shoulder. Moreover people that are suffering from a hunched back can ease their complaints with a regular chest stretching.
The muscles of the human body are all-rounders. It is fascinating what our musculature is able to do. Besides steering the locomotor system our more than 600 skeletal muscles have a lot of other very important functions.