It has been well established that yoga is safe during pregnancy and postpartum and all classes prescribed will be suitable for women up to 20-wks gestation (the maximum possible based on our study eligibility). At any time during the study, if the participant's medical team advise her not to participate in yoga or other exercise, she would be immediately withdrawn from the study. Pregnancy status will be tracked throughout the 12-week study period via weekly assessment in weekly logs.