The few times I've tried them, I quickly learned to hate exercise bikes, and treadmills as well. Best indoor workout for me is Nordic Track (ski machine), which is made tolerable by listening to music, or better yet, video on a little portable player (which I hope to purchase at Goodwill). I can do up to an hour's workout on the Nordic Track, and will resume doing so when the weather gets too snotty for bike riding.
Walked with a friend a few days ago, and a couple minutes into our walk, he suddenly upped the pace, and I had to work hard to keep up. He's quite athletic, and skis almost every weekend, though he found he'd almost forgotten how to ride his old 10 speed, and crashed it. Turned out he has some heart rhythm issues, and carries a little device that clamps on a finger and gives heart rate and oxygen something-or-other. He wondered why I didn't use such a device, and all I could think of was that my own sense of what's going on with my body is plenty of info for me, maybe even too much. Anyhow, we're both 86, and are living on borrowed time, so I can't work myself into a tizzy about my own health. True, my wife will be pissed if I die before cleaning up my workshop. I'll feel guilty about that up to the point when I'm actually dead, after which I won't feel anything at all.
Oh, just turned over 2,000 miles on the bike (took several years, and I realize some of you put on 2000 miles per month). But remarkably, I've never had a flat tire, and only needed to top up 3 or 4 times. The tires are CST Metropolitan Palmbay, 26X2.15. They have an ordinary street tread. It does say on the sidewall that they are for ebikes. Chinese, of course. They came on the bike, an Ariel Rider C class (step-thru). I have ridden them willy nilly, mostly on paved streets, quite a bit on gravel trails, and a few times on some very rough roads, where staying upright was a challenge. Even rode amongst goat heads in Eastern Washington. I do carry a spare tube and tire changing tools, but haven't needed them at all.