Mick Jagger is pushing himself through a punishing training and nutrition schedule, and those close to him tell RadarOnline.com it is driven by a desire to keep "death at arm's length" as he continues fronting The Rolling Stones with the stamina of someone half his age.

Jagger, 82, has spent decades maintaining a strict health routine, but scrutiny of his age-defying lifestyle has intensified after the publication of Pacto Con El Diablo: Los Hábitos Saludables del Rolling Stone Más Dinámico del Mundo by author Isadora Puiggené. Article continues below advertisement

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It examines how the singer's obsessive discipli

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