“…Animal studies concerning the effects of exercise on pregnancy imply that intensive exercise is harmful to a developing fetus (Bonds & Delivoria-Papadopoulos, 1985;Garris, Kasperek, Overton, & Alligood, 1985). Garris et al (1985) noted decreased uteroplacental blood flow, as well as a decreased incidence of live births, in rats exercised from 1 to 18 days or 12 to 18 days during gestation.…”