If you're under 35 and in good health, you don't need to see a doctor before beginning an exercise program. But if you are over 35 and have been inactive for several years, you should consult your physician, who may or may not recommend a graded exercise test. Other conditions that indicate a need for medical clearance are: .High blood pressure .Heart trouble .Family history of early stroke or heart attack deaths .Frequent dizzy spells .Extreme breathlessness after mild exertion .Arthritis or other bone problems .Severe muscular, ligament or tendon problems .Other known or suspected disease

Vigorous exercise involves minimal health risks for persons in good health or those following a doctor's advice. Far greater risks are present by habitual inactivity and obesity.