You can change a player's position to improve other attributes. In Franchise mode, you can make your Wide Receiver improve his blocking or your defensive lineman speed faster just by changing their position. Go to "Player Management" and change any player to another position (for example, your strong safety to a linebacker). Select that SS (who now is a LB) and do the Smart LB drill. When you complete the drill correctly, switch him back to his original SS position. The points you earn will reflect as a Smart Safety.