Bruce Springsteen may be 76, but his physique and stamina suggest a man half his age – the result of what insiders tell RadarOnline.com is a "brutal, military-style" routine that keeps the Boss lean, sharp, and stage-ready.

Those close to him say the Born in the U.S.A. legend's strict fitness and diet regime is as intense as any rock tour he's ever done, with the star pushing himself to extremes most would find impossible. Article continues below advertisement

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The New Jersey icon, who wrapped one of the biggest world tours of his career earlier this year – more than 100 shows, 4.9 million tickets sold, and over $500 million in re

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