for me it's hard to pin point. on days where i'm succeptable to cramping up (legs, back) i'll up the sodium by adding extra salt to almost all my meals. but i also have to keep in mind that my blood pressure shoots up with too much sodium. I think you have to be instinctual with sodium. add it when you need it. and don't go overboard. as for prep. i have my guys keep sodium in almost all the way through then depending on howthey look peak week we make adjustments. i am NEVER with cutting sodium out completely for ANY reason. it is vital for a lot of things.