You touch your chin to your chest this is of the neck?

When you touch your chin to your chest, you are performing a movement called cervical flexion. This action involves the bending of the neck forward, primarily engaging the muscles in the front of the neck, such as the sternocleidomastoid and the longus colli. It also helps to stretch and lengthen the muscles in the back of the neck. This motion is essential for various activities, including looking down or nodding.