Sentence:  It's a bold statement (not to mention a cliché), but Mr. Cardiello, who created this high-energy workout to bring football to <WSD>sideliners</WSD>, isn't afraid to be bold: he is a private trainer for N.F.L. players and former conditioning coach in the Arena Football League. 
Meaning of the word marked with <WSD> tags:  One who stays on the sidelines; a spectator or nonparticipant.