Suspension therapy involves suspending parts of the body in the air using ropes, slings, and other equipment attached to fixed points above. This allows for increased range of motion, muscle strengthening, and other benefits by reducing friction and gravity's effects. There are different types of suspension including vertical, axial, and pendular suspension, each providing support or movement in different ways. Various materials like ropes, slings, cleats, and frames are used to safely suspend and move body parts for therapeutic goals like improved flexibility, circulation, and muscle properties.