January 15, 2012 11:20 am From the 2012 Health and Fitness Expo: Get Moving! News4’s Doreen Gentzler gets back on the exercise floor at the NBC4 Health and Fitness Expo Local 2:54 ‘Healthy moms equal healthy babies': Children's National offers maternal health care 2:14 Opioid crisis: National drug take back day on Saturday 2:55 Concussion treatment: Returning to school and limiting screen time may help, study finds 2:39 What to know about ADHD medication and pregnancy 2:08 How to pick the best running shoes for outdoor exercise