It is not regular table salt but smelling salts that contain ammonium. The ammonia will irritate mucous membranes. It activates your inhalation reflect and increases your breath in heart rate. That will activate your flight-or-fight response and release adrenaline and other hormones. This will make you muscle preformed better if they are requited to do hard work like living weight.
If you have suddenly been afraid of something and you suddenly feel more awake and alert you have had the same flight-or-fight response trigger. It is an artificial way to activate the same thing.
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