That pretty much guarantees a good cardio workout if they're anything like the little guy I take care of. Actually, he's one of the reasons I took up cycling -- I wanted to get in shape so I could hang with him...

One of our favorite games is: "On your march, Get Ready, Get Ssse... -- Hey you cheater! Get back here! Wait for me!"

A few of those games and I'm about done...
... But no matter what kind of shape I'm in, I suspect he will always win. (Besides: he cheats!)