If you are like me, you get a pretty good workout doing home remodeling, especially the afterburn.
“Afterburn” I call it because my do-it-yourself projects burn me year after year, like the concrete laid for my home gym floor. I call it my washboard abs place because the surface of the floor looks like a washboard, only with larger ridges. One spot on the floor looks like the crater that took the impact of the meteor that killed all the dinosaurs.
I covered up my handiwork with rubber matting. Anyone entering my gym would suspect this depression is actually a floor drain. I am constantly stapling the stalactite insulation on my ceiling, and I have strategically placed my certificates to cover flaws in the walls, anyway those that will stay on.

For an overall upper-body workout, I like to do the ab roller, in some circles called the Hell Wheel and rightly so. I can perform this exercise with enough reps that it has become monotonous. To my serendipity, I discovered that the big New York City pothole in my floor gave me a variation to make this exercise harder while targeting muscle fiber I would otherwise miss.
So, somehow in my Petrasian logic, I like to think flaws can fix things, at least they can at my house.

Now, if only I can figure out where to put the floor drain.