The first thing I recommend to most hard training athletes and clients of mine is to start by adding a little sea salt to most of their meals. Sea salt is the kind of sodium you want, not regular table salt.
The next thing I tell them is to eat pickles. Pickles are my number one biggest secret physique and performance enhancing food. I’m dead serious. If you usually watch your sodium intake start eating a few pickles a day and tell me if you don’t start getting way better pumps and having significantly better workouts. I’ve never seen it fail to work.