Exercise barely burns any calories compared to the calories burned through your daily activities, like breathing, moving around, etc.

Think Mark, think! If you need on average 2k calories to maintain your current weight, that means your body is already burning 2k calories a day for you doing nothing extra like working out.

What working out really helps with (aside of “increasing strength”) is to keep your body in motion and flexible. When your body is in motion it will ramp up your metabolism throughout the day (comparatively to a sedentary lifestyle).

Also, you have a default level of strength that does not need exercise to maintain. So if I can lift a 40lb bag of dog food with ease, then I can keep doing that regardless of I work out. Now, factor in that if my job was to load and unload 40lb bags of dog food every day, I’d probably get stronger just because my job is my exercise.

Sorry for the rambling, but my point is that there is so much more to being fit and healthy than simply exercising (and I imagine super heroes do all those other things too by way of their “job”).