I've purchased several GMB programs and love all of them. They're challenging without being overwhelming, and even deep into the programs there's not a hint of monotony. I can tell the difference they've made in my overall fitness. I'm 50 years old, and my flexibility and mobility are the best they've been since I played sports in high school, and in terms of strength I have a mastery of my own body weight that I've never experienced before. Some movements I assumed I would never be able to do when I first saw them. With work, however, I was able to and at the same time be surprised by what I was capable of. In short, I can't recommend programs like Mobility, Integral Strength, and Literal Immortality enough.