This is because I am too nervous. It takes time and effort to practice standing piles. Every time the pile is practiced to a certain extent (between one minute and two minutes), when my body just gets hot, my skin is in a state of tension and my blood has begun to boil. In addition, wearing too many clothes during practice makes the itching worse (just like thousands of reptiles crawling on me, it is unbearable, but as long as you sweat out of your body, this itchy problem is unbearable. This is just normal common sense, so I don't have to be nervous about it.