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Britney was back at Bally yesterday and all the online rumblings about her possibly being paid by the gym to make 'appearances' are starting to sound less and less unlikely. I mean, Brit could exercise at home with a hot personal trainer so why is she doing it at Bally in Culver City of all places?

AND another question ... Brit still looks like she's in a funk, no?

We got fifteen angles of bland yesterday when we shot the girl after her workout. Isn't exercise supposed to release endorphins that make you feel good -- give you a rush?

What happened to the happy go-lucky Britney we used to know (and no, I'm not talking about the wild, driving-around-at-2am-to-RiteAid Brit); I'm talking about the old Brit, circa 2006)? Is she ever coming back?

CLICK HERE for the GALLERY of Brit back at Bally!