Don't show up late. Don't try to slide out early. Don't cheat your rep counts. And definitely, don't hold back. Leave it all in the gym!
The first thing people lose on a diet is their sense of humor. Keep it fun. Keep it light.
I always advise eating regular meals — a mix of healthy carbs, protein and fruits and veggies.
I had one actress who trained with me and took six Spin classes a week. And all she ate was lettuce and Swedish Fish. When the press asked her how she'd transformed' her body, she said, Oh, I do yoga and hike with my puppy.' That made me laugh. Don't lie about how much you work out, because other women are going to think, I walk my dog, why don't I look like that?