The flexors of the elbow consist of three muscles that are involved in the bicep stretch, and include:
The muscle that most people know about is the biceps brachii, or more commonly just called the biceps. It is made up of two heads, which mean there are two attachment points on the processes of the scapula (shoulder blade). They unite and then attaches primarily to the radius.
This bicep stretch will help improve and maintain the function of the muscle. As mentioned before, the biceps brachii has attachments in the shoulder complex, and, therefore, can also help with your shoulder and chest function.
By taking the time to perform this stretch it will help in the prevention of not only bicep injury, but also reduce your chances of hurting your shoulders and/or chest.