In addition to determining the effect of regular physical activity on neonatal outcomes, measuring maternal lipid metabolism and oxidative stress profiles will provide valuable knowledge about mechanisms responsible for improved outcomes in physically active pregnant women. Also, measuring maternal lipid metabolism and oxidative stress profiles during exercise is novel and clinically insightful. This paradigm holds the potential to reveal alterations in maternal metabolism and/or oxidative stress profiles that may not be detected when measuring these factors at rest. Additionally, measuring metabolism and oxidative stress during exercise is clinically useful by providing information about maternal metabolism during activities that will mimic daily lifestyle tasks such as childcare, household chores, etc. (~3-5 METS). Thus, this study design will provide us with valuable insight and enhanced understanding of maternal lipid metabolism and oxidative stress profiles during everyday lifestyle activities.