Exercise is detrimental to women undergoing in vitro fertilization (IVF), suggests this prospective study of over 2,000 women. 

Researchers from Massachusetts found that women who exercised 4 or more hours per week for 1 to 9 years before attempting IVF were 40% less likely to have a live birth (OR 0.6; CI 0.4–0.8), almost three times more likely to experience cycle cancellation (OR 2.8; CI 1.5–5.3), and twice as likely to have an implantation failure (OR 2.0; CI 1.4–3.1) or a pregnancy loss (OR 2.0; CI 1.2–3.4) as women who did not report exercising.  

More specifically, women who engaged in regular cardiovascular activity had a 30% lower chance of having a live birth (OR 0.7; CI 0.6–0.9) than women who were sedentary. 

Morris SN, Missmer SA, Cramer DW, et al. Effects of lifetime exercise on the outcome of in vitro fertilization. 

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Exercise is detrimental to women undergoing in vitro fertilization (IVF), suggests this prospective study of over 2,000 women.