I am a Muay Thai practitioner who pays attention to hardness. When practicing my legs, you can smooth the calf and tibia with a grinder every day 1 hour, which is similar to 1 month. It's normal to buy some medicine to activate the tibia at the drugstore. This is a process, and then the calf needs to practice some muscles when hitting the ball. In the process of kicking hard objects, first of all, kick the tree slowly and forcefully, and feel that you can bear the force of+. After that, the strength of kicking the wall is also slow+the whole fever kicks the calf and tibia without pain. If you can kick the tree wall with all your strength, it will take about three years. It is said that Thailand 10 can kick down a banana tree with one leg. I wonder if it's true. Oh, I think it is still possible. After practicing for 3 months, the hardness drops to 1 year, which is almost the same. After two years of practice, the hardness will gradually increase! In the early stage, the hardness improved rapidly, but in the first three months after basic training, the calf, tibia and muscles were all swollen and painful, but it doesn't matter. The calf recovery ability has improved in these three months, and it was very painful at that time. 1 minute later, I didn't feel sick. After half a year, I will itch if I don't kick hard objects, and my joints will hurt slightly in winter, but it doesn't matter. Hehe, friends, come on.