Which muscle has its insertion on the xiphoid process of the sternum?

The muscle that has its insertion on the xiphoid process of the sternum is the diaphragm. The diaphragm is the primary muscle involved in respiration, and its central tendon attaches to the xiphoid process, as well as to the lower ribs and lumbar vertebrae. This attachment helps facilitate the expansion and contraction of the thoracic cavity during breathing.