Meredith Dobrosielski, 36, exercises on a treadmill in Dr. Andrew Satin's lab as part of a health study about pregnant women and the effects of exercise. was an avid runner for several years and is now in her 31st week of pregnancy. Linds Szymanski, MD, Maternal Fetal Medicine Fellow, right, is running the tests for Dr. Satin.
Baltimore Sun photo by Algerina Perna