Fitness can only make you stronger, healthier and more energetic (excessive harm to your body). You should practice fighting and Ma Jiashu in fighting. You have to practice shooting to kill people. Although skills are useless in the face of absolute strength, what if this person has both skills and strength? Some people who only exercise will have the illusion that muscles can be bulletproof and stab-proof. Who do you think you are? Is fitness asking for death and getting yourself into trouble? An ordinary person cuts your head with a dustpan. Which muscle can prevent cuts?