Special forces didn't recruit at that time, but picked out ordinary soldiers with unusual physique and intelligence for special training and finally became special forces! Some are good at mountain jungle fighting, some are good at underwater diving, and some are good at snow fighting. The first condition is that you must be in good health, have endurance and be able to play! I heard from people I know that there will be many exams for you in the first three months. For example, just after sleeping in winter, I was covered with cold water. The whistle will suddenly sound in the middle of the night. When you hear the whistle, you should gather and run! So you'd better practice long-distance running first, because health is the capital of revolution!