For many, the words ¡°training camp¡± and ¡°summer¡± are synonymous with American football and particularly the NFL.

Ever since George Plimpton¡¯s 1966 book ¡°Paper Lion¡± first drew back the curtain on what takes place inside a professional football camp, sports fans have been fascinated by the annual rite of passage.

Training camp has grown from obscure practice in Plimpton¡¯s day to full-on extravaganza in recent years, with spectators flocking in their thousands to university campuses around the United States to watch their favorite players run drills and participate in one-on-ones.