I've watched American football, boring. When it is ten minutes to half-time, and it takes half an hour to play with offense and defense trooping on and off the field, spare me.
Of course they would be off the field on a stretcher, they have none of the padding, and don't weigh 120 kg. They'd be cut from the team as too slow.
How many of those lard-a3ses could do 16-20 km in a match without blowing a gasket?
Australian Rules is about speed and agility. American football is about knocking down barn doors.