In the case that a woman becomes pregnant during this study we will ask her to complete the Physical Activity Readiness Medical Examination for Pregnancy (PARmed-X for Pregnancy), a health-screening tool for participation in prenatal exercise. The PARmed-X for pregnancy is completed with their primary care physician to identify any contraindications to exercise, and includes 29 questions pertaining to general health status, status of current pregnancy, physical activity habits over the last month, and absolute and relative contraindications.