Some great suggestions already. For me, it's a matter of feeling good; exercise improves my self-image, feelings of self-worth, and helps keep me happy and healthy. When I'm healthier, everything is better! (same can be said for being happy!)
Additionally though, there are all sorts of gyms/clubs that need volunteers to help work with kids. I haven't been to a single boxing gym where extra help wasn't accepted and appreciated. I'm sure many other styles of gyms or community clubs (think volleyball, soccer, baseball, really any sport!) would love the assistance.
It also depends what you consider exercise. Do you need to train like an athlete on a competitive level or just get the blood flowing? I feel best when I surf a couple days/week and train in the fight gym 4-5 days/week on top of that. Since finding MMM though, the gym is gone and will begin working out in my yard soon, I think. If you don't need anything of that magnitude, get a scooter/skateboard/bike and do your errands/commute on it and that can be your exercise.
Or take up gardening.
Or sit on the floor more often.
Or only use the hand-basket at the market so you're forced to carry your groceries.
Or do 5 squats before entering the bathroom and 5 pushups when you leave.
Tomorrow morning I'm meeting friends at 0700 and will be going surfing for a couple hours. It gets my heart rate up and body moving but I don't consider it exercise. Last week GF and I have a vacation that was 6 nights of camping/backpacking and almost 60miles of hiking. That IS exercise but it didn't feel like working out because it had specific purpose.
For me, "exercise/working out" is hitting the track/street and running. I hate it but understand it as a necessary evil to maintaining weight, physique, and CP function. As such, it's what gets the least focus. Going into a gym, the garage, backyard, and hitting a bag never feels like working out and I always feel amazing.
tl;dr incorporating exercise into daily life is simple. find a way to be active that doesn't feel like "working out" to you and you won't ever think about exercising again