experience with p90x. [ .] i had my first child in, um, 2002 and i was in the marine corps at that time. they give you about six weeks to get back into shape, and i was pretty much forced into getting back into shape really quick. fast-forward seven years later, i m pregnant with my second child. i m not in the marine te one nie infomercial for p90x and i knew that, from my past history of training in the marine corps, that this would be perfect for me. my husband told me, you know, we can do this as long as we can cancel our gym memberships, and so we said sayonara to over $200 a month in gym memberships. you don t need to go to the gym and do leg extensions all the time and leg curls all the time and squats all the time. you need to mix it up. variety is the key. demi: i love the intensity that it brought. it was simple yet it had a science to it with this muscle confusion.