Human limitation is a joke

I’ve been watching a lot of training videos online to come up with an optimized workout plan, including those of gymnastics, Taekwondo, Judo, Jiu Jitsu, boxing, MMA, calisthenics, and even the circus. Yes, I’ve been watching them because they were just incredible and fun. Anyway, I’m always amazed at how high the human body can go while how low my (cursed) body has gone.

How much time and energy would they have spent to break the limitations we’ve believed there were?

Human limitation is a joke. Is there really a limitation in a sense?