I just read in Oxygen magazine--a source I was inclined to trust--an article on pregnancy and exercise. The article says it is stating 2002 ACOG guidelines and it lists the heart rate NOT above 140 rule. But, here, Sheila and/or Cathe says that the ACOG revised this, and above 140 is ok. Has anyone actually seen this guideline in writing? I was surprised that their pamphlet cost $19.95! Thanks Gina (still worried because I keep reading about how this is the time when my babies internal organs are forming and I shouldn't over do it.)