If you are renovating a house, you are getting some of the same benefits that you get from a gym, but in a more natural setting. Why worry about lifting weights in a gym when you can lift other "weights" renovating a house.
The idea behind fitness is getting your heart pumping and blood flowing in some kind of physical activity, exertion of muscles, and proper nutrition. And there are many ways to do this besides going to a gym. Years ago gyms didn't even exist and yet people were more fit and had better looking bodies than today.
When you go grocery shopping, instead of trying to find the closest parking stall to the door, look for the farthest one from the door.
Instead of taking the elevator, climb the steps instead. What better stair stepper is there, then real flights of steps? lol
In warmer weather, Instead of always taking your car everywhere you go, walk, run, or get a bike and ride it. What better way to get fit than to ride a bike, instead of those boring stationary bikes that don't go anywhere. lol
You need to explore your world more and expand your horizons because you have gotten yourself in a rut and fail to see all the opportunities you have to get fit right in your every day activiities.