I tried loads of exercise before discovering cycling: swimming (really boring), going to the gym (induced so much dread in me that I ended up having panic attacks), and running (personally found the really awful as a larger person and couldn’t maintain it at all).
So yeah: I ride bikes, a lot. Don’t really see it as exercise anymore, it’s way more than that for me, which is the key, I think, and the reason I ride about 300km a week without really giving it a second thought. I ride to work every day, I ride at weekends with a club and also on my own and with pals. I’ve met so many people through bike riding. Every holiday I have been on in the last three years has revolved around riding bikes, and I generally wouldn’t entertain the idea of “being off the bike” for more than a week these days. I genuinely get itchy if I’ve not been riding for a couple of days. As others above have said, it does actual wonders for my mental health.