For many women, pregnancy is an exciting time of glowing and growing. For 30-year-old model Sarah Stage, she opted for triceps in her trimester, obliques in her obstetrics and crunches until contractions. This first-time mom generated a heated debate about the safety of fit-pregnancy, but this week she gave birth to a healthy 8-pound baby boy.

Here she is just 4 days after giving birth– talk about a bounce back!