What position did Saquon Barkley primarily play?

What position did Derrick Henry primarily play? Derrick Henry is best known for playing with which NFL team? Which college was Derrick Henry playing for when he entered the NFL? What jersey number did Derrick Henry wear with the Titans? Which college was Saquon Barkley playing for when he entered the NFL? What position did Christian McCaffrey primarily play? Christian McCaffrey is best known for playing with which NFL team? Which college was Christian McCaffrey playing for when he entered the NFL?