Forgive me if this was already asked, but:
Watching TV I keep seeing a glowing yellow line marking ten yards away from the scrimmage line. I know why it’s there…but how do they do it.
Forgive me if this was already asked, but:
Watching TV I keep seeing a glowing yellow line marking ten yards away from the scrimmage line. I know why it’s there…but how do they do it.
From this thread comes this link.