Isaiah was even involved in his famous mom's cool-down routine. "When your post-workout stretch turns you into a human jungle gym...#StayThePath @caliabycarrie #fitness #workout #fitmom #HealthyLifestyle," Carrie captioned a selfie of her son pinching her nose.
ET caught up with Carrie at last Sunday's American Music Awards and she couldn't help but gush over her and husband Mike Fisher's son. "I tell him that almost daily that he's the best thing that me or my husband ever did -- he's amazing," she said. "At the end of the day, no matter what I'm a mom."