This document discusses therapeutic modalities used in athletic training including cryotherapy, thermotherapy, ultrasound, and mechanical modalities. It provides details on the physiological effects and applications of different modalities, focusing on electromagnetic modalities like various heating and cooling treatments. Cryotherapy and thermotherapy are electromagnetic modalities that rely on cooling or heating tissue through conduction, convection, or radiation to impact the healing process by altering blood flow, reducing inflammation and pain, and affecting muscle spasms.