Posted on Tue Apr 10th, 2012 11:20am PDT
Hilary Duff is determined to get her pre-baby body back ASAP!
The former Lizzie McGuire star, who gave birth to her first child on March 20, worked it out at a pilates class in LA with big sister Haylie. Her newborn son Luca must have stayed home with dad.
Mike Comrie's 24-year-old wifey recently Tweeted, "20 minutes on the elliptical [trainer] seems like an eternity!!! What the hell!"
Every little step counts!
SEE THE GALLERY Hilary Duff Goes For A Late Night Workout
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