A wife is running in the park and takes a break to stretch near two men.
As she’s stretching, a beautiful woman passes all three of them, and one guy says to the other, “lets go, that’s our pace car,” and they run off.
The wife, very perplexed, waits for her husband to come home.
She tells him what she saw in the park and asks, “what’s a pace car?”
The husband replies, “a Pace Car is a woman so fit and beautiful you run extra hard to stay behind her and keep up your speed.”
With a smile and a flight the wife asks, “am I your pace car?”
The husband looks up and down for a second and says… “yeah, if you were behind me!