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A joint is defined as a point where two or more bones meet, allowing for movement and flexibility in the skeletal system. Joints can be classified based on their structure and function, including types such as fibrous, cartilaginous, and synovial joints, each having distinct characteristics and ranges of motion.

Understanding the role of joints is crucial in fitness and training, as they are involved in all physical activities. Knowledge of joint function can aid in creating effective training programs that promote mobility and stability, while also helping to prevent injuries that may occur from overuse or improper movement patterns.

In contrast, muscles are responsible for movement and stability but are not where bones meet. Ligaments connect bones to other bones at joints, and tendons connect muscles to bones, supporting movement but not serving as the point of connection between bones themselves.