Coordination. wherefore art thou?

Question: When the hell does coordination kick in for a developing child?  If it's any time before age five. my son is hosed.

I had the"pleasure" of watching him flub his way through tae kwon do class today. And I can make all manners of excuses:

• It was after school, and he was tired
• He was hungry / thirsty / cold
• He wasn't on his best behavior, falling over to make a scene
• It was one of the more permissive teachers, so he wasn't getting the best instruction or the firmest discipline 
• The class was exceptionally full, so he was distracted

Or I can go with the likely truth: he's a spaz. 

He spins with the grace of a drunk teamster in five-inch heels.  His stance resembles a bowlegged ostrich. His kicks make him look like Godzilla dealing with a thong-induced wedgie. And when you put those moves together for a series of spinning kicks, instead of pivoting towards the front of the room, he slowly tacks to the left like a Dodge Aries K with a bent axle.  He bumps into classmates. He trips. he slips. In short, he's a mess.

Sure, he's not even five. Most of his classmates have a year on him - he started in the class as early as is permissible.  And his punches and blocks at least have the air of authenticity (though I think that's due in no small part to his fierce "hee-ya!").  But when combined with his inability to string together three breast strokes in the pool without erupting from the water in a trashing convulsion, or to catch a ball without it first ricocheting off his noggin, I do get a bit concerned. 

I know. Nothing's set in stone. At seventeen, he might be getting a scholarship to quarterback at Stanford. Then again, at seventeen he could be working on nursing his eighth self-induced concussion.  Either way, I'm suspecting there's a football helmet in his future.