But if you are working out because you want to become healthier, is that not a form of payment? Dopamine is what the body uses to pay itself, as it is the neurotransmitter that acts as the reward based learning system. As you are jogging or working out, the brain is dumping dopamine along with oxytocin and serotonin. Thus, it is easily said that working out to seek health is working out to get paid. No?