I think the feeling of runners high is the body using up more oxygen than the lungs are able to put into the body and you have hypoxia. That is the lack of oxygen to the cells, in this case body wide and including the brain.
The lack of oxygen in the brain makes it start to shut down and you get that dizzy and floating feeling when it sets in.
Lack of oxygen=Runners high
I think the feeling of runners high is the body using up more oxygen than the lungs are able to put into the body and you have hypoxia. That is the lack of oxygen to the cells, in this case body wide and including the brain.
The lack of oxygen in the brain makes it start to shut down and you get that dizzy and floating feeling when it sets in.