Eagles running back Will Shipley is impressing in training camp as he pushes for playing time behind Saquon Barkley.

Only nine running backs have ever rushed for over 2,000 yards in a single season. In a volatile position with a short shelf life, running backs have struggled to find ways to secure both high pay and long-term value.

Saquon Barkley is a historian of the NFL, a player who studies the game's past while trying to rewrite that history and etch his own name in the record books. Barkley certainly made history last season,