The document summarizes the author's research into various physical aspects of American football, such as the speed of receivers, force of hits by safeties, and velocity of passes by quarterbacks. Through online research and informal experiments, the author found that average NFL receivers can run 10 yards in 1.1 seconds, equivalent to around 18 mph, while the hardest throws from quarterback Peyton Manning reached an estimated 59 mph. Safety collisions exert around 1000 pounds per square inch of force.