Philadelphia Eagles coach Chip Kelly has been plotting a football revolution since he was hired this winter to turn around the team's fortunes.

His plan is to continue the philosophy he perfected as the coach at Oregon: to run every play as quickly as possible with no huddles and no stoppages in play, all aimed at leaving the defense doubled over in exhaustion. This "up-tempo" strategy, already popular at the college level, looks like it could change the pro game forever. There is just one small problem standing...