you sure as fuck do, playboy
you keep your eyes on the target, get up a head of steam, then you get low, and just before you make contact, you gotta lower your head or break your neck in the collision, or at the very least shock your spine, preventing you from getting a good hold on your bitch, so you cant drag him down.
you've clearly never even SEEN a football game, youre probably assuming it's just like Futbol, or rugby, but it aint.
hitting the line at scrimmage isnt a game of red rover like rugby, its a trainwreck.
350 pound dudes flying into the air, pads getting crushed into shards which always slide right into your jock, and bones breaking.
if you keep your head up, youll get it knocked clean off.