Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Karas is on Target

Several years back, Kenneth Cooper, the doctor who coined the word "aerobics" wrote a book called the Anti Oxidant Solution or something to that effect. In that book, he noted that he had become incresingly concerned about the prevelance of catastrophic illnesses among some elite athletes. He indicated that an alarming number of long distance runners ended up with cancer or heart disease because of the strain it placed on the immune system and heart muscle. I was a runner for years -didn't smoke or overeat. I was diagnosed with atrial fibrillation in 1995 and which has become quite common among former runners. There's no doubt running and other forms of aerobics get you fit but the damage it does to the body is considerable. Beyond cancer and heart disease there are knee, hip, and foot problems from overuse and repeated pavement pounding.I think you can get all the cardio benefits with weights and no impact actvities such as bike riding.