Snipers need to observe carefully, so the second thing is to be careful, such as counting stars.
Snipers need to carefully calculate shooting parameters, so the third is quick calculation and mental calculation, and high school mathematics can't be too bad.
Snipers need stable hands, so the fourth is to exercise their arm strength frequently, such as supporting bricks.
Snipers need good psychological quality, so the fifth is to exercise their minds. Taishan collapsed in front of them without changing color, such as watching a horror movie.