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Hi Geonho, Thanks for posting. What sort of programming have you been using lately for your bodyweight training? Have you been gaining mostly muscle? To achieve the skills you mentioned, you should definitely be starting on the GymFit Subscription Foundation and Handstand workouts.
Yeah I agree with Alessandro. Tumbling can cause injuries if done in a safe environment, imagine in a non safe environment... Maybe you can find some place where they teach circus stuff. They usually teach aerial skills that include round offs, handsprings and flips, and they have pits.