Timeline of the american football helmet
This invention has been important to promoting movement and or healthy bodies because it lessens the fear of getting seriously injured.
They aren't necessarily effective because people still get horrible brain damage but it's because you can make helmets for the outside of your head but not for inside so there isn't really a way i can think of to make it more effective
Hornung, Chris. “Who Invented the Football Helmet?”
Antique Football, Antique Football,
Tucker, Z C. “Evolution of the Football Helmet.”
“Riddell | Protect and Perform.” Riddell - A Leader in
Football Gear, www.riddell.com/history.