The title of the (relatively) famous 1960s pop song, “Not too little, not too much” seems perfectly to summarize the results of a recent study of the association between physical activity and cartilage degeneration.
Frequent participation in high-impact activities such as running appears associated with more degnerated cartilage and potentially a higher risk for the development of osteoarthritis. Lower impact sports are likely to be more beneficial for individuals at risk for osteoarthritis but too little activity may also accelerate degeneration.