Fergie, Kelly Osbourne and more are talking up their favorite fitness tricks and must-do routines
Credit: Most Wanted
Updated: Wednesday Jun 01, 2011 | 01:00 PM EDT
By: Alex Apatoff and Katherine Kluznik Rentmeester
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“[I] never did anything this intensive before," Gyllenhaal says of bulking up for his newest film by practicing parkour, the French physical discipline that involves jumping and climbing obstacles.
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