If you could win one, and only one Olympic event, what would your choice be?
For me it would probably be the Marathon.
At first I thought you meant which swimming event. For me, that would be the 10k. Someday I'd like to do a 10k; I'm shooting for a 5k next year. The longest I've done so far is 2.6 miles.
As for any event at all, winning the decathlon or the modern pentathlon would be pretty cool because of the versatility and conditioning you'd have to have to do so.
