Hornung lettered in all three major sports (football, basketball, and baseball) all four of his high school years.
In college, he dropped baseball, continuing with basketball and football.
As to the latter sport, during his collegiate career, Hornung won the Heisman Trophy, and was eventually inducted into the College Football Hall of Fame.
In the pros, he was the first player chosen in the 1957 draft, won an MVP, and ended up in the NFL Hall of Fame, too (in 1986).
Hornung was primarily a running back for the Green Bay Packers from 1957 to 1966, but was also a placekicker and played quarterback a bit.