

A typical hamburger is about 500 kcal so you would have to go up those stairs 100 times to burn it off in theory.
But science is now saying that burning off calories isn’t related to excersise… you burn the same amount doing or not doing physical activity. So I don’t know if this is relevant anymore.
Pre-teen is the worst age for this. Just try to get your kid past this the best you can. Happens everywhere, eventually they will mature and learn.
Heck, this is always the plot in school movies.