system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: How does stretching affect the body?

Animals and humans alike seem to enjoy a good stretch when first waking up or after being still for a long time. What affect does stretching have on the body that makes it so instinctual?
gpt
Stretching does a few different things. First, it helps to align the tissues that connect your muscles to your bones. Second, whenever you move a muscle, the muscle will send signals communicating how long it has been extended. If it extends too far, it will receive a message telling it to contract – the purpose being to prevent injury. This message can be overridden by stretching correctly, granting a higher range of motion.