When I first became active about 8 years ago, if I thought I had to start out at that level, I never would have taken that first step into the gym- and I wasn't nearly as heavy or out of shape as they appear to be.
I wonder if the show encourages people to get moving, or intimidates them?

Have you ever watched the AMC show Heavy? I've seen previews, but have never watched it. It seems like it does a better job of being realistic about life changes, not just short-term huge weight loss (but I don't know- I've never actually seen it).