While I obviously can't speak for everyone, I've always found that it matters a great deal when our moms see us do what we're passionate about.
In my case, I'm grateful to say that my mother came to every performance of every play I was in as a kid. And while that level of support was staggering on its own, it bordered on unbelievable when I was in something called The Disney Spectacular, which I didn't even think was worth seeing once.
But even though I didn't have any interest in sports growing up, I did find some familiar feelings arise in the full video. For one NFL player, knowing that his mom was watching him achieve something means just as much now as it did when he was growing up.