The investigators investigated the effects of a supervised maternal exercise training program (performed during the 2nd and 3rd trimesters of pregnancy) on maternal-newborn unit health outcomes in a group of previously sedentary healthy women. A matched control group was assessed over the same time period. Given the fact that most studies in the field have used aerobic exercises, here the investigators largely focused on very light resistance, toning exercises.

Inclusion Criteria:

• sedentary (not exercising >20 minutes on >3 days per week)
• with singleton
• not at high risk for preterm delivery (no more than one previous preterm deliveries)
• women planning to give birth in the same obstetrics hospital department (Hospital Severo Ochoa, Madrid, Spain)

Exclusion Criteria:

• not being under medical follow-up throughout the entire pregnancy period were not included in the study
• women having serious medical condition that prevent them from exercising safely