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Er, power walks?

We spotted Reese Witherspoon and a pal getting some exercise in Brentwood today, and the Oscar winner beamed as she completed her daily cardio sesh.

It was recently announced that Reese will be honored by the Art Institute of Chicago's Gene Siskel Film Center next summer, and she will host "A Summer Evening With Reese Witherspoon" in Chi-Town in June. Does she ever take a break?!