In Canada, there are more than 350,000 childbirths per year (Statistics Canada, 2019). In the final phase of pregnancy, women can have a birth with or without complications (WHO, 2018; Public Health Agency of Canada, 2018). According to several researchers, physical activity in several cases helps prevent some of these complications (Public Health Ontario, 2015 ; Government du Québec, 2019). The present study aimed to determine whether physical activity plays a part in reducing the etiological factors of three delivery complications: macrosomia, perineal tears as well as caesarean section and, through this analysis, determine whether physical activity acts as a preventative measure. The results obtained underline the key preventative role of a physical activity intervention and of leisure with regard to macrosomia and caesarean section. As for the contribution of physical activity in reducing the risk of perineal tears, more research is needed to determine if its role is significant.