Some students have physical disabilities that mean that they are unable to undertake the same range of physical activities as other people. This includes people with mobility problems (who may use wheelchairs or walking aids) or dexterity problems - due to the loss of a hand or limb or chronic arthritis for example.
In addition to the mobility problem itself, people may have added problems: some people get fatigued and need rest periods; they may experience pain, or side effects from treatment. Most conditions are stable but some, such as muscular dystrophy, multiple sclerosis, ME and AIDS are degenerative, or may vary over time, with good and bad periods.