Clenched and Proud

Amongst a small group of friends:
Me: "I don't mean to embarrass you, but remember that time you refused to go jogging because you didn't want anyone to see the way your thighs were jiggling?"

Sister: "Oh that doesn't embarrass me at all. I walk around with my butt cheeks clenched tighter than the Sheriff of Queer-Town.....(long reflective pause)...or maybe the Deputy...whoever is the catcher."