some of the guys I coached youth sports with would sometimes run with the kids

40 ... 60 ... even 100 yd dash

and of course they would often pull up limping lol

at one point - later years - my youngest kid ran 4.85 40 ... low 7 60 ...

that might not seem fast - especially compared to the large number of top athletes that run 4.4 40’s etc - but 4.85 40 is still honkin compared to the avg joe

one kid from his high school class ran a 10.27 100m this past year while competing in college ... he is a world class athlete / future Olympic hopeful