Fanny you yet again have no idea. Have any of you played NFL? Ok obviously I haven't played in the real NFL but I played for just one season with a local team here. Not just praising myself here (because as everyone knows I am a worthless cripple with a smashed foot and haven't played any real sport for 15 months now so I am really fat and unfit right now) but I am 6'6", was inhumanly fit and very strong. I had played a lot of sports at various high levels going back to Melbourne Tigers junior rep team, Monash Uni, VBA, and also for some nice teams (not basketball) you may have heard of called Victoria and Australia.
So being 100% arrogant and having a few guys from the gym I knew playing Gridiron I decided to give it a try confident that I would dominate and just smash everyone. How wrong I was. No skill? There is so much skill you wouldn't believe it. The first few weeks we trained without pads and I was quite good, I was mostly in the top three out of 50 players in most of the strength and fitness tests, but once we had all the gear on I was pathetic. I couldn't see, couldn't move and everyone could take me down.
I remember on the seond night with pads a friend of mine who is tiny, about 5'11" was trying to help me and he told me to hit him. I didn't want to hit him so I just ran up and gave me a bump. He told me to do ti properly. He was so small and I was a giant machine of destruction. I gave him a small bump again. He started abusing me, called me every name under the sun. So ok, he asked for it. I took a few steps back, got a good run up and with 105KG going at full speed while he was standing still just slammed right into him. His feet didn't move but I was splattered all over the ground and didn't know what day it was.
After just one season of failure I had a million brusies, many dazing/concussions, several sprains and a torn knee that ended it and would later require surgery. I knew first hand. Gridiron is tough. Gridiron is skilfull. Girdiron is a lot of fun...to watch!