most people when they engage in cardiovascular activity for about 20 minutes or so moderate intensity one of the changes that you see in the brain is an increase in endocannabinoids which is the neurotransmitter that cannabis mimics and if you work really hard you can get also an endorphin rush but the core high ally isn't endorphins it's endocannabinoids so some people experience that as a kind of euphoria but a lot of people experience it as just feeling better