They may be boring for you, because you have your own experiences, your own inclinations, your own way of seeing stuff.
It's perfectly reasonable to believe that there must be people for which treadmills are incredible.
I like riding and running outside, sometimes really early in the morning when the sea is good for surfing. But I can understand people who would consider the few miles I have to run or ride to the beach utterly boring to ride or run a few days a week.
Other than the different asshole drivers trying to kill me from time to time, there isn't much variety in my outside rides tbh. I can understand someone preferring riding a Peloton bike under nice air-conditioning, with their favorite music in the background, under the watchful eyes of their cat, while watching they kids playing outside.
