I belong to a gym with a nurse on site and one of those heart machines so I really shouldn't feel uncomfortable but I do. I walk constantly because I stay home with my kids who won't stay still and I try to walk them around the neighborhood. Full blown running is the thing I'm worried about, but yeah I'm going to try it soon. P90x is tough but I've heard great things about it. I want to get it for my husband. There is a guy on their website who had a heart attack and now is doing that program. Talk about ballsy!
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