During pregnancy, tone your abs with crunches and sit-ups during the first and second trimester. Work out abs during pregnancy withtips from a nationally-certified personal trainer in this free video on exercise and fitness. Expert: Jani Roberts Contact: www.janiwestroberts.com Bio: Jani Roberts is a graduate of the American Academy of Nutrition and owner of The Wellness Company of Dunedin. Roberts is a nationally certified personal trainer and group fitness instructor. Filmmaker: …