Tedium vs. Mulling Time
You need “mulling time.” Mulling is a special process that our brains require. It’s that time when you have nothing else to think about except something that’s been eating on you, such as whether to buy an Eskimo husky or a cockatoo … or maybe a pet rock.
Walking or running on a treadmill can provide you with a lot of mulling time. Just tune out, quit looking at the clock and ponder that important dilemma: How can we achieve world peace? Did Jesus die for Martians, too, if there are any? Are there infinitely many real quadratic number fields with unique factorization?
Swimming laps in a pool is also great mulling time. So is running laps in a gym, training for a marathon or rowing. And if you enjoy long-distance bicycling – or indoor stationary pedaling – mulling works for miles and miles.