During his college days at LSU, Leonard Fournette was famous for trucking over defenders.
If you need an example of that, here's a clip of Fournette absolutely destroying an Ole Miss defender back in October 2016.
In the NFL, it's not as easy to run over a defender, and that's mainly because NFL players are about twice the size as most college players.
The other thing about the NFL is that no matter how big you are, you'll occasionally run into players who can truck you back. That's exactly what happened to the 225-pound Fournette during a Jaguars practice on Friday.