<unk>  in this context means physical activity, not specifically<unk>  in a fitness program. For example, a person with<unk>  after a heart attack may not be able to sustain the amount of physical activity needed to walk through a grocery store or to cook a meal. In a person who does not tolerate<unk>  well, physical activity may cause unusual breathlessness (dyspnea), muscle pain (myalgia), tachypnoea (abnormally rapid breathing), tachycardia (having a faster heart rate than normal) or increasing muscle weakness; or<unk>  might result in severe headache, nausea, dizziness, occasional muscle cramps or extreme fatigue, which would make it intolerable. The three most common reasons people give for being unable to tolerate a normal amount of<unk>  or physical activity are: * breathlessness – commonly seen in people with lung diseases, and heart disease. * fatigue – when it appears early in an<unk>  test, it is usually due to deconditioning (either through a sedentary lifestyle or while convalescing from a long illness), but it can indicate heart, lung or neuromuscular diseases. * pain – can be caused by a variety of medical conditions, such as arthritis, claudication, peripheral vascular disease, or angina. Chronic pain that makes a person unwilling to undertake a physical activity is not, by itself, a form of<unk> .
Exercise intolerance
Paroxysmal nocturnal dyspnoea
Heat intolerance
Alarm fatigue
Palpitations
Platypnea
Myxedema
Tachypnea