Carrie Underwood
’s secret to dropping the 30 pounds she gained over her pregnancy takes just 30 minutes.

It’s her favorite workout at the moment -- Tabata. She tells Shape, “I’m in love with it! It’s hard, but it really works. I choose seven different exercises, like squats, lunges, or push-ups, and do eight rounds of each -- 20 seconds on, 20 seconds off for eight rounds. It really revs up my metabolism. When I’m done, I can handle anything."

Carrie is the new cover of Shape’s November issue, which hits newsstands Tuesday, so make sure you snag your copy!

Photo: Getty Images