'GMA' Live Stream Workout: Julianne Hough's Favorite Cardio Dance Routine
"We do lots of mat work, body-weight moves and free weights," Hough told "Good Morning America." "The trampoline cardio might sound crazy, but it's a great low-impact option. Hough, a Fitbit ambassador, is bringing Body by Simone's full-body workout to a special live stream on ABCNews.com/live and the GMA Facebook page on Wednesday, Jan. 4 at 8 a.m. ET.