Well, I guess he should take good care of himself.
[Really just, trying to keep face here, but there's some flustered chuckling. He really doesn't know what he's getting himself into.] I'll see what I can do!
[He gets up from his seat and discarding his towel --] Well! I'll be fighting with this thing -- [motions to the punching bag again.] a bit more. You heading back to class?