Watching all the fighting in the world or watching martial arts scientifically. It is suggested to learn from American mixed martial arts or Krafmaga in Israel, both of which are actual combat. To practice hand strength, it is suggested to practice arm muscles, biceps and forearm muscles first, lift more dumbbells and do more push-ups to strengthen arm strength. It is recommended to practice explosive power by tying heavy objects with both hands, and often hit hard objects with both fists.