I have read this book, and tried it out. The problem with Convict Conditioning is that it is inferior to using weights. You can't incrementally make progress. If I lift weights, the next week, I can add on a pound or two. With bodyweight fitness, you can either do it, or you can't. You progress is highly based on volume. Not saying bodyweight fitness is bad, it's good, but weights is the way to go if you want to get stronger faster.
If bodyweight fitness was superior, all these people coming out of prison would be on their way to Olympic gold. But that's not the case at all. There's a ceiling for them. Having weights, you can lift more than you weigh.
Re-read the book. There are ten different versions of each core exercise. Each one progressively more difficult.
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