There is an interesting chapter in _Excellence Without a Soul_ by Harry Lewis, suggesting that garde inflation is less a problem that widely believed. You could look it up.
I worked with a programmer who was legally blind. He used speech-recognition software plus some sort of display software that blew each character up to about 10" x 6".
Many years ago a neighbor of ours, riding his son's motorcycle at something around walking pace, collided with his daughter's bicycle, and fell off on his head. He died, she got away with a broken arm.
I have written a certain amount of Javascript this year to run on Windows machines. This was because a) I needed the scripts to run on Windows, b) I did not wish to have to install another language (say Python) on the machines, c) I really really did not want to do them in VBScript.
You could change the NFL a great deal by changing the substitution rules, and making players play both ways as they commonly did before about 1960. You'd probably see the linemen come down to about linebacker size, and the skill positions to about defensive back size.
Meanwhile I'm waiting for the obsessive parents of America to read up on the cumulative effects of heading soccer balls.
Elite runners can take enough out of themselves that the recovery is much longer. Recreational runners--well, I used to be able to do two or three every fall. Hell, I knew a guy who would run one a week. He drove race directors crazy, because he expected the gates open and the tee shirt ready when he got to the line in 5:30 or 6:00.