What surprises me is the agility and speed with which 300-pound linemen manuever. I played a lot of amateur sports--softball, tennis, cycling--at half that weight when I was in my 20s, but with half the finesse they have. Go figure.
As rabid as football fans are in the U.S., worldwide American football is way down the list in fan base. Here is a listing of sports by popularity:
1) Soccer (Football): 3.3-3.5 billion fans (Europe, Africa, Asia, Americas, etc.)
2) Cricket: 2-3 billion fans (India, UK, Pakistan, Asia, Australia, etc.)
3) Field hockey: 2-2.2 billion fans (Asia, Europe, Africa, Australia)
4) Tennis: Around 1 billion fans (Europe, Americas, Asia)
5) Volleyball: Around 900 million fans (Asia, Europe, Americas, Australia)
6) Table tennis: Around 900 million fans (Asia, Europe, Africa, Americas)
7) Baseball: Around 500 million fans (US, Japan, Cuba, Dominican Republic)
8) Golf: Around 400 million fans (US, Canada, Europe)
9) Gridiron (American football): 390-410 million fans (US mainly)
10) Basketball: Not more than 400 million fans (US, Canada mainly)