Layering too many dopamine-releasing activities into workouts can decrease pleasure and motivation derived from them.

“What I realized was that some time ago I probably experienced a incredible increase in the amount of dopamine during one of my workouts, because I enjoy working out and I enjoy listening to music. I also enjoy listening to podcasts, I also enjoy communicating with people. Those are all wonderful pursuits, but I had layered in too many of them too many times. And then it essentially wasn't working for me anymore. Much in the same way a drug wouldn't work for somebody who takes it repeatedly because their baseline of dopamine is dropping.”