Carrie Underwood has been MIA since giving birth to her first child, son Isaiah Michael Fisher, on Feb. 27.

But now, three months later, the 32-year-old is showing off her rockin' post-baby body in a promotional still for her sportswear line, CALIA by Carrie Underwood.

carrie underwood
CALIA by Carrie Underwood via E!

"We do lots of lunges, squats, plyometrics, stairs, pull-ups along with weight training," her trainer, Erin Oprea, told E! "The key to the success is keeping all of this at your level and not to do too much too soon. Listen to your body."

Check out more stars who successfully dropped their baby weight in the gallery below!