Why are nuns such great sprint runners?
'Cause they're used to being chaste.
Why did the vegetarian stop running cross country?
He did not like the meets.
Two tomatoes went jogging. One trips and falls. The other tomato said, "Grab my Heinz and I'll help you up." Trippy tomato replies, "Nah, you go ahead. I'll ketchup."
What do you call a free treadmill?
The Great Outdoors.
Why can't tomatoes ever beat lettuce in a race?
Because lettuce is always a head, and tomatoes have to ketchup!