Original: Nicknamed '' Sir Charles '' for his aggressive and outspoken demeanor , and '' The Round Mound of Rebound '' , for his unusual build and talent as a player , Barkley established himself as one of the National Basketball Association 's ( NBA 's ) most dominating power forwards .
Simplified: Nicknamed '' Sir Charles '' for his aggressive and outspoken demeanor , and '' The Round Mound of Rebound , '' for his unusual build and talent as a player , Barkley established himself as one of the National Basketball Association 's most dominating power forwards .