I went to a training camp in Phuket Thailand years ago and trained at Tiger Muay Thai. (Where I got my profile picture of me with the tiger) The people there had so much discipline and had been training since they were young to make their shins so strong or resilient to the pain. They would kick the boxing bags over and over with their shins and not flinch. The first time I did it I felt like I broke a bone. 😂 It was a truly amazing experience watching and training with them. Their focus and dedication is amazing.