What is this usage of between the hash marks

[chris98251]

Wow, look how much the game opens up when you use the middle of the field. Been a while since we seen that kind of play on offense.

 

[MORGULON]

I am excited for new coordinators and new concepts. I was listening to a podcast on YouTube and even they were saying that Seattle was really predictable on offense. These teams are too good for that.

 

[slateman77]

Amazing huh..Hopefully we see that all the time.!!