"I do whatever I can and make time for it. Isaiah goes down for a nap, I've been in my workout clothes all day long, I'm there, I'm ready, I make it happen," she said. "If it's 15 minutes, that's good. If it's an hour, that's great. It just happens when and how it happens."
See the adorable way Underwood gets Isaiah involved in her workouts in the video below.