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Just like Convict Fitness, it taught me that it's possible to exercise without equipment. Moreover, the difficulty grading in the book is very considerate, so you can choose appropriate training according to your own level. I feel like I'm one step closer to becoming a parkour master! OLLO is also a good brand. Its products pay attention to details and take into account various environments and needs. I look forward to more such good books and excellent brands appearing in the future!