Actually, mine was a "class" in that a group of us were being monitored/guided at one time ...although I was the only one, apparently, who was there for pulmonary rehab while the others were there for cardio rehab. This was actually at Mayo Clinic, and I had the impression that very few people were actually sent there for pulmonary rehab. I had expected my oxygen level, etc., to be monitored more closely but they were more concerned about my blood pressure. As a heart patient with three stents and a pacemaker, I've also gone through cardio rehab in the past and there wasn't much difference in types of exercises. I have to add: the staff were very nice and concerned about me; I just don't think the program was tailored to my needs as it should have been.