Joints, muscles and bones make up the body's basic movement apparatus, but they are not immune to problems and diseases. Joint problems such as arthritis and overuse can cause pain and limitation of movement. Muscle injuries such as strains are common, especially from improper training or accidents. Skeletal problems include osteoporosis and deformities that can affect posture and stability. To manage these problems, it is important to understand their causes and seek professional care when necessary. Exercise, proper nutrition and ergonomic habits can also help prevent problems with the joints, muscles and skeleton. Caring for this important part of the body is essential to maintaining an active and healthy lifestyle.