I love it. I was a fat kid, lost a ton of weight at 30. Got really into biking which gave me strong legs but made me look like an alien. So I started lifting weights to balance that out (and improve my biking). I also started running without any break-in period because my bike fitness carried over to running well enough.

Now I love all three sports for their own sake. I have gone through phases focusing on each one and have developed training methodologies for each. I especially love biking in the summer, lifting in fall and spring, and running in the snow.

The key as I understand it is to set goals and start small, work your way into it. Also go slower on cardio; learn what zone 2 is and spend 80% of your time there. It is better to be slow and enjoy it than go too fast, burn out, and suffer.

Lifting weights feels like a routine. As someone else said, there is purity on watching your body work, looking at your form, and pushing for PRs. I highly recommend Wendel's 5-3-1 program.

Biking is very freeing, you can go anywhere with enough time. Very calming, in your head time.

Running is shorter and more intense, even at an easy pace I don't usually want to go more than an hour. But it also feels good for the rest of the day, and there is something charming about getting all sweaty from doing awesome things.