Trainieren wie im Knast: Der progressive Ganzkörperplan für Muskeln, Kraft und einen eisernen Willen

The concept of using 'lost secrets' from prison culture is intriguing—did the author experience or research this environment firsthand?

The gradual approach makes sense but also felt demanding. How did others feel about the difficulty level for beginners?

The focus on bodyweight exercises and minimal equipment is unique—does it really hold up against traditional strength training for long-term results?