Don't smoke and drink, and don't eat pungent food, such as betel nut and garlic.

Calm down and don't talk often.

Trim your nails regularly, polish your index finger and keep your fingers sensitive.

Protect your eyesight in various ways.

Snipers are generally fat.

Of course, this is not to say that all snipers are like this. The above behavior habits are all adopted by snipers in order to better maintain their state.