I realized something while doing my core routine. When I'm exercising I noticed that my thought process is in overdrive. Since I'm more aware I noticed this. The same applies to cold showers and probably every other physical demanding activity. When I meditate I still have a lot of monkey mind, but exercise has a lot more monkey chatter. It has it's pros, I get more insights while meditating and shutting of the thinking process is even harder then while meditating.
My theory is that this has something to do with oxygen intake and blood circulation to the brain. I wonder if other introverts experience the same thing. And I wonder what happens from an extroverts point of view.