3. Have any condition as defined by the American College of Sports Medicine's as "relative contraindications to exercise testing" (left main coronary stenosis; moderate stenotic valvular heart disease; electrolyte abnormalities; severe arterial hypertension at rest; hypertrophic cardiomyopathy and other forms of outflow tract obstruction; neuromuscular, musculoskeletal, or rheumatoid disorders that are exacerbated by exercise; high-degree atrioventricular block; ventricular aneurysm; uncontrolled metabolic disease; chronic infectious disease).