It would be best to take it to a vet and ask if he has anything on him, or if he is going through some sort of emotional state
It is important to stretch before exercising because for example if you were to be doing a strenuous workout it causes the blood vessels in your legs to expand. Which then causes more blood into your legs and feet. If you were to stop after a while of exercising your heart rate slows down and blood can pool into your lower body which could cause you to possibly faint.
You can only see it if you use a microscope and you cannot taste it or smell it
because its nice and shiny because your eye changes in light pepoils and brain comes in because through your eye is your brain
