Dopamine is your brain’s reward system. Dopamine is the ‘pleasure’ chemical that is released when you do something that your brain likes. The problem is, your brain’s reward system is not logical. By that, I mean that it does not only reward you for things that are good for you.
Brett Favre was known as the ‘Iron Man’ of football, way before the Marvel movie hype started. He had the NFL record for most pass yards and still holds the record for most starts with 298 games. Brett Favre was known for being tough. He got those records by playing through pain and never giving up.