couple of months. Take it gradually, and definitely do some core stability and pelvic floor exercises. Don't expect to be anywhere near your pre-pregnancy fitness. – Jayne EcottYou know your body better than your midwife doesThe key thing is to do what

of exercises you can do at home without any special equipment, and a lot more that you can do if you invest in a gym ball and some dumb-bells. But the best form of running-specific core training is probably to put on a pair of fell-shoes and gallop up and down

. There are some simple rules to follow for beginner runners:1. Good shoes: properly fitted by a running specialist2. Run slowly: slower than you think you need3. Don't increase distance by more than 10% each week4. Don't increase both distance and intensity