It's always good to have a back up plan if you're playing professional sports. You're only one injury or indiscretion away from never playing again. In terms of football, there aren't many other jobs that can use your skill of running into other men at high speeds. For Mike Mayock, after he was done playing for the New York Giants, he became a notable writer and analyst for the NFL. That's how you keep that money coming in, even when the tackles stop.
His daughter, Leigh Mayok, has gotten involved in football, just like her father, though she's not playing or anything like that. She used to do PR for the Minnesota Vikings, and currently works in sports entertainment. She's active on twitter, promoting an organization to stop blood clotting. Surprisingly, according to the site 274 people die every day from blood clots.