Jennifer Garner smiling sweats walking Brentwood

Jennifer Garner left the kids at home and went for an early morning workout on Thursday, and we can't believe she gave birth to baby Samuel 8 months ago -- she looks better than she did before having Violet and Seraphina!

Too bad Ben Affleck is so busy working on new film projects -- think he has any time to appreciate his wife's hot post-baby bod? Hey, at least he's spending plenty of time with their three kids! After Jen's workout, we spotted the proud parents with their youngest daughter, who seems to be obsessed with glasses these days:

Ben Affleck, Jennifer Garner Brentwood family