[ Excuse??? If he was Unsure before, now he's definitely very Sure—or more like very Offended that she would call such important things dumb. ]

Such things are hardly stupid—why, they're highly important to a well-maintained and disciplined lifestyle!

[ Commence: full preaching mode. ]

They help keep the mind and body sound. How else do you keep in shape if not by exercising on the regular?

[ Also he's just gonna ignore that comment about naughty words because....no. ]