There are several ways this question can be answered since there are several 'yard' categories and football leagues. Emmit Smith holds the NFL's record for most rushing yards at 18,355 years over his 14 year career.
Brett fare
48
Trent Richardson
Emmitt Smith
Ben Hayes in 1921 rushed for 3,928 yards.
There are 100 yards in football and 4 downs.
8.8 American football fields.
Ben Mauk threw for 17,364 yards from 1999-2002
Drew Brees
tim brown
56 yards
Tayvon Alston