Middle-aged people who overdo exercises may risk having arthritis or knee problems, a new study said. In an experiment of people aged 45 to 55, which was presented to the Radiological Society of North America by Dr. Christoph Stehling, those who exercised the most are found out to be prone to knee damage.

Although knee problems and joint pains are always associated with being overweight, all the participants in the study are of normal and healthy weights. Dr. Stehling then recommended that all middle-aged people exercise with just the right amount of intensity. He stressed though that “high-impact, weight-bearing physical activity, such as running and jumping, may be worse for cartilage health.”

For a more healthy and fit body, try low-impact exercises like swimming, cycling, yoga and pilates since these can build cartilage and can help protect your bones.