Salt may have benefits for athletes when consumed in moderation as part of a pre-workout routine, including improved hydration, exercise performance, endurance, blood flow, muscle contraction, and potentially increased muscle size. 

Salt, or sodium, is often considered harmful due to its association with health problems like high blood pressure. However, salt also plays a critical role in hydration and muscle function, making it a potential tool for athletes. Pre-workout supplements typically contain ingredients like caffeine and creatine but usually have little to no salt. Consuming salt pre-workout may have benefits like helping with hydration, improving exercise performance, increasing endurance, boosting blood flow, improving muscle contraction, and potentially increasing muscle size. However, the amount of salt to consume pre-workout varies depending on factors like how much you sweat and how long you exercise. It’s best to consult with a doctor before incorporating a new pre-workout variable. 

Source: https://barbend.com/salt-pre-workout/