Overuse injuries occur because you are not giving your body enough time to recover from an activity

This is true. Your body must have rest days and down times in order for the muscle tissues to repair themselves. When you participate in activities your muscle fibers tear, and they need time to repair, or if you dont rest that will lead you to overuse injuries. It is different for different people because if you are not very active your muscle fibers need more time to repair compared to someone who is always active because there body is used to it. Hope i helped!