I could always throw the ball really well (like 65 yards in the air with velocity at age ~14 etc), was pretty fast (never timed), but never played organized football. I was a very good grade school track athlete but grew too fast one summer (like 6", ended up at 6ft even in 9th grade, which was't bad for the late 1980's) and my achilles tendons were never the same, I could not really sprint after that growth spurt without serious tendon pain. Tried out for HS football, was the 2nd fastest on the team(all white dudes so there is that), but quit when the Dr told me about tendon issue and not to play HS football, it would save my knees. I did all the stupid crap kids do plus more dangerous stuff being a weekend bull work warrior, never broke a bone, however physical physique and muscular prowess is just not in my genetics. I tried bodybuilding for about 3 years eating nothing but chicken and broccoli, best shape I have ever been in is 190 lbs, 9% BF @ 6ft tall. Football players are born, you HAVE to have the genetics, most of us simply do not. Not only do you have to be a physical freak, you have to be made of iron and never get hurt. I'm glad I listed to the Dr and did not play HS football, I have some family members/coworkers who did and they have knee and hip replacements before age 60. The vast majority of humans simply cannot play this game.