Behaviors that initially lack short-term rewards can become self-reinforcing as the brain associates them with intrinsic rewards.

“But over time, as you mentioned, what's going to happen is your craving for that smoothie is going to go down as your brain begins to realize, oh, actually, when I run, I feel great afterwards. I feel endorphins. I feel dopamine. I feel these endocanaboids. Right? There's this kind of like there's this soup of good feeling in my head. your brain starts saying, "I don't actually need the smoothie. I don't crave crave the smoothie quite as much. I don't need that smoothie because I just I feel good afterwards. That's the reward." So, the reward has moved from exttrinsic to intrinsic. And that's a really important transition because that means the behavior becomes self-reinforcing without external rewards.”