title: Invited commentary.
authors.affiliation: Department of Obstetrics and Gynecology, Washington University School of Medicine, St Louis, MO 63110, USA. Stephensa@wudosis.wustl.edu
authors.forename: Andrea
authors.initials: A
authors.lastname: Stephens
mesh_terms: D015444:Exercise; D005260:Female; D006801:Humans; D017410:Practice Guidelines as Topic; D011247:Pregnancy; D011295:Prenatal Care