Exercise and other kinds of physical activity can go far in keeping your body strong and healthy, able to fight disease, and ward off injuries from pulling, pushing, and lifting. A healthy and fit body also generally recovers faster from injury and pain.
In general, there are three basic types of exercise: strengthening, stretching, and aerobic.
Here's a brief description:
Other kinds of mild exercises include those that help you correct or maintain good posture (with a focus on the neck and back) and ease tension from prolonged periods of sitting.