one inch punch is a kind of extreme Kung Fu. You can only do it after professional study, otherwise you will hurt yourself.
If you want to learn, you need to take some measures to protect yourself in the early stage, This link is a column about sports protection and post injury treatment in my Amazon store: https://a.co/7Y8QUEB
These are the protective gear I collected to protect you from extreme explosive sports and the treatment plan after injury, I will earn commission here. Thank you