Am in my second trimester and a neighbour recently scared me with some disturbing info. She said that if I exercise or walk too much, it could harm my baby physically. Am sure that's incorrect. Can anybody guide me?

My female friend was walking too much during her 2nd trimester and in the end her gynae told her not to walk so much because her baby could be harmed. So instead she listened to her gynae's advice and tried to walk lesser, she has a healthy baby later on too. And also her number 2 as well.