You may find my eBooks on the subject at:
https://www.smashwords.com/books/view/206194
The Deadly Art Of Iron Palm
&
https://www.smashwords.com/books/view/221792
Diamond Palm Training Methods
You may find my eBooks on the subject at:
https://www.smashwords.com/books/view/206194
&
https://www.smashwords.com/books/view/221792