It can limit the range of a player's motion in that leg, and make the leg weak. Surgery is sometimes done for these sports injuries, but physiotherapy is always a part of the treatment. The three major exercises done to start the healing process of ACL are heel slides, quad sets, and straight leg raises. Some of them are heat, acupuncture, ultrasound, and electrical stimulation. There is a need for physiotherapy in amputee rehabilitation that no other discipline can fill. It is a basic kind of help that anyone who has lost a limb can use. Some amputees decline treatment because they do not think it is necessary. People with chronic airways disease often have a problem with weakening legs. This is because, as they have trouble breathing, they avoid walking or doing physical exercise of any sort. The goal of physiotherapy in this case is to strengthen the legs through treadmill-walking or stationary-cycling. This can only be done, however, if the patient is well enough to start out. Massage, chiropractic, and other hands-on methods are important. All these methods tend to promote better health, both physical and psychological. Equipment for helping patients regain their strength and mobility are a part of what is physiotherapy. This equipment may allow a person who is partially paralyzed to get the most exercise possible. Physiotherapy for cardiac surgery patients is often not carried out by physiotherapy staff. Nurses in hospitals and clinics who are trained to deal with these areas of rehabilitation for cardiac surgery will do the work. However, physiotherapists sometimes help, and the principles are the same. The physiotherapist will instruct the patient about what activities are acceptable in the weeks and months after surgery. Physiotherapists begin stroke rehabilitation very soon after the stroke has occurred, while the patient is still in acute care. The physiotherapist will first do an evaluation to determine what disabilities must be dealt with during stroke rehabilitation. Some of the possible problems are: lack of strength and endurance, limited range of motion, problems with sensation in the limbs, and troubles walking.