In addition to eating healthy, it is also important to exercise to maintain strong, healthy bones.  Exercise is important in building strong bones, as movement stimulates the mesenchymal stem cells in the bone marrow to create osteoblasts – the bone-forming cells. Movement also directs the stem cells to operate in the correct way. Inactivity creates fat cells. Sixty minutes or more of moderate-to-vigorous daily activity is recommended for children and teens. Exercising early in life provides lasting benefits by establishing lifelong habits of physical activity.