Exercise sounds like the sort of things parents would get their kids to do if they acted out a lot. He doesn't know why he knows that, but he gets the feeling that's what happens. Talking it out would probably be better...

"Those sound fun." So much is true, at least. "Maybe you can do other things, too. Something you really want."

He thinks... "My mum gets sweets when I'm feeling sad, sometimes. One of the friends I live with makes cocoa, or we go out for ice cream. Those are nice too."