One fundamental difference between rugby and NFL is how many players are involved in frontal impact on each play or phase of play. In rugby football you are onl

One fundamental difference between rugby and NFL is how many players are involved in frontal impact on each play or phase of play. In rugby football you are only allowed to tackle a player with the ball (except in rucks and mauls, which are by their nature more structured) whereas in american football there seem to me to be a whole lot of players running headfirst into each other on every play. Having said all that, my experience with rugby players is that there is a certain bravado about injuries, that if you haven't cracked a few ribs, broken a clavicle, had a stud through your cheek, etc. then you aren't playing hard enough; and should therefore buy the next round