Not in your comfort zone, but this is something that you can do on your own at least. Try riding a bike, if you’re able to do so. I started a couple summers ago and I really enjoy it. The changes in how far, fast, long, I could ride became a big motivator after a couple of months. When it’s hot, I like it because I make my own wind so I don’t feel so hot. I got some candy to take with me that I only eat on bike rides, and I found a few places that I could ride to to get some ice cream or other treats. If you do decide to give it a go, I would suggest looking around for a used mountain bike to begin with, nothing special, just something that is mechanically sound and easy to ride.