Sometimes they were football players before they were wrestlers. Other times, it was just the opposite. Some did both at the same time back before it was frowned upon.
If you collect Topps football cards issued in the 1960s and 70s, there is a fair chance some of those players are more well known to historians of the mat.
If you collect some really obscure college or regional sets, you might find even more guys appearing "before they were stars". PW Torch breaks down who's where...and why.