Flexhibitionist
Those guys in spandex that workout by jogging on sidewalks that lie directly beside busy city streets that stop mid-workout to stretch publicly, showcasing both their bodies and flexibility.
Q: Why is that guy just standing there on the sidewalk and stretching?
A: Because he's a flexhibitionist. That's what they do.
A: Because he's a flexhibitionist. That's what they do.