According to WebMD.com https://www.webmd.com/baby/exercise-during-pregnancy#1 Webmd: pregnancy and exercise WebMD – Exercise while Pregnant WebMD http://www.webmd.com/baby/exercise-during-pregnancy all the risks source http://www.webmd.com/baby/exercise-during-pregnancy overexertion can cause harm to the fetus Regular exercise safe exercise during pregnancy Pregnancy: exercise during pregnancy American College of Obstetrics and Gynecology http://www.webmd.com/baby/exercise-during-pregnancy 30 minutes or more Exercise During Pregnancy before beginning any type of fitness routine safe exercise during pregnancy este estudio