We have taught millions of readers how to become world experts on their bodies. And now we’re rewinding the clock to share insights into how the body is made — from scratch. Pregnancy offers huge opportunities for growth — emotionally and physically. If you want the physical part to return to normal after delivery, you’ll want to start early. Working with celebrity trainers Joel Harper and Tracy Hafen, as well as obstetrician Margaret McKenzie, we have crafted four short yet effective workouts to keep your body tuned in each trimester, as well as one for immediately after the delivery. We also have special exercises to keep your pelvic floor strong and keep everything working the way it used to.” —Drs. Mike Roizen and Mehmet Oz