This is the first study to examine the relationship between physical activity, lipid metabolism and oxidative stress in obese pregnancy. We anticipate that results from the proposed study will demonstrate the importance of a physically active lifestyle during pregnancy (irrespective of body weight) in order to maximize the short and long-term health of the neonate. In addition, we hope that these results will encourage obese and overweight women of childbearing age to remain or become physically active by demonstrating that physical inactivity has a greater effect on poor neonatal outcomes than obesity. These findings are unique as much of the current literature focuses on the negative impact of maternal obesity on neonatal outcomes. Blair et al. has consistently demonstrated in non-gravid populations that physical inactivity is a stronger predictor of all-cause mortality than obesity (Blair 1989, 1999). Similarly, we believe physical activity in pregnancy is more important than simply maintaining a healthy body weight in improving neonatal outcomes. This idea is novel and innovative as it is previously unexplored in pregnancy and pregnancy outcomes.