Jason Segel might not have seen much time on the court, but he WAS Jason Collins' backup in high school. That totally counts!
Dwayne "The Rock" Johnson
Before becoming a professional wrestler and eventually an actor, Dwayne "The Rock" Johnson was leading the University of Miami football team to a National Championship title in 1991.
It might be hard to believe by looking at him now, but once upon a time Bruce Jenner was an Olympian.
Before she was walking the runway in the Victoria's Secret Fashion Show and gracing the cover of Sports Illustrated's Swimsuit Edition, Kate Upton was a nationally ranked equestrian. So many bouncing boob jokes about barrel jumping. So little time.
Jessica Biel's soccer training came in handy when she played Mary Camden on Seventh Heaven. Mary was a star soccer player. Biel also took gymnastics as a child.
Before he was 2 Chainz, he was Tauheed Epps (also Tity Boi, but we won't talk about that.) Epps was a star high school basketball player at North Clayon High School in Georgia.