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We sought to examine the levels, types, and changes of physical activity and their correlates among pregnant women. Data came from 9,889 pregnant women with due dates between April 1, 1991 and December 31, 1992 who were participants of the Avon Longitudinal Study of Parents and Children (ALSPAC) in Bristol, Avon, Southwest England. Self-reported physical activity during pregnancy was collected via questionnaires administered at 18 and 32 weeks of gestation. We found, at 18 weeks of gestation, the prevalence of engaging in physical activity that was sufficient to cause sweating for ≥3 h/week (referred to as strenuous physical activity) was 48.8%. This percentage was similar at 32 weeks of gestation. The most common physical activity during pregnancy reported by these women was brisk walking, followed by swimming and ante-natal exercise. In models that mutually adjusted for all …