His expression says, not particularly, but instead he merely asks in kind:

"Do you?"

Mike's never really been one to just run...for running's sake. Make it a race and not only is he there, but he's there with bells on. And if you're Raph...he's there running backwards with bells on so as to trash talk you more effectively.

In addition to that, Leo's just getting over, well...what ever it was that they had to get over. Is going for a run right now the best of all possible things for you, big blue?