It's not a secret to you if you have watched football for the last 40 years; a guy once almost big enough to be a linebacker can't even be a safety today. Elite athletes are getting bigger.
Specifically, while the average human has gained about 1.9 inches in
height since 1900, new research showed that the fastest swimmers
have grown 4.5 inches and the swiftest runners have grown 6.4 inches.
In a new analysis, Jordan Charles, an engineering student who
graduated this spring, collected the heights and weights of the fastest
swimmers (100 meters) and sprinters (100 meters) for world record
winners since 1900. He then correlated the size growth of these
athletes with their winning times.