'Thintervention' Host Jackie Warner's Shape-Up Tips

Celebrity personal trainer and "Thintervention" host Jackie Warner shared some tough love with "Extra" about healthy living. She pointed out the biggest mistake people make when they start to diet, and the best workout. Plus, how much weight is safe to lose in one week?

Watch the video -- and don't miss the season premiere of "Thintervention" September 6 at 10/9c on Bravo.