Tony Horton has trained Bruce Springsteen, Tom Petty, Stevie Nicks, even Billy Idol. Actors Ben Stiller and Ashton Kutcher have raved about his exercise DVDs. But it was the news that fitness buff and Republican vice presidential nominee Paul Ryan swears by Horton’s P90X workout that catapulted the regimen into the spotlight — and cemented Horton’s status as New England’s answer to Jack LaLanne.
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