This maximal exertion stresses anaerobic energy pathways. Caffeine consumption before constant load exercise is associated with reduced perceived exertion. Massaging the forearm muscles also alleviates the tightness that occurs with muscles exertion. Symptoms include exercise intolerance, exertional syncope (fainting from physical exertion) and sudden death. The symptoms are an intolerance to physical exertion or activity, cramps and muscle pain. Elevated muscle and blood lactate concentrations are a natural consequence of any physical exertion. This may lead to angina pectoris (chest pain or tightness on exertion) or heart attacks. Stable angina is chest pain on exertion that improves with rest. Heat stroke occurs because of high external temperatures or physical exertion. Angina is typically precipitated by exertion or emotional stress. Humans have a high capacity to expend energy for many hours during sustained exertion. I'd rather go for an awkward moment than physical exertion any day. This is when a person prepares themselves for significant physical exertion. This form of stretching prepares the body for physical exertion and sports performance. One definition is a habitual disinclination to exertion, or laziness.