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After spending twelve hours at work, most of us would rather do anything other than work out - but that's just what sets Britney Spears apart from us!

We XCLUSIVELY caught the pop princess returning to the Ritz Carlton's gym to hit the treadmill late yesterday evening. Of course, seeing Britney go to the gym is hardly anything new - but after she'd been at Fox Studios working on her upcoming episode of HIMYM since 7:30 AM that morning, we gotta say that we're impressed with her stamina!