New York Jets linebacker Brandon Copeland, 27, knows that his football career has an expiration date. "It's guaranteed football is going to be over one day," the NFL star told ESPN in 2017.

That's why Copeland is planning ahead: The Wharton School graduate, who spent two summers interning at the investment bank UBS in college, took an off-season job on Wall Street in 2017. He also has experience flipping houses and opened a real estate company with his wife last year.