Let's perform a thought exercise. You are an NFL running back.
Check that, you are an undrafted, undersized, underdog NFL running back fighting for a roster spot. You're playing in your first career NFL preseason game, participating in your first series of the game. Your first rush was nothing special. Your second rush went 8 yards, but short of a first down.
You take the ball one more time, on second-and-2. You find a hole for the first down and meet your first tackle attempt 2 yards later. But you don't stop there.