The Need for Salt During Extensive Exercise

In episode 10a you briefly mentioned what the need for sodium is during endurance exercise. Can we I guess just quickly recap that before we start looking into actually how much we need. Yeah so I guess firstly we need to understand biologically what sodium does within the body and then that gives us a bit of a sense of you know why it might be useful to replace during exercise. 50% roughly 50% of all the sodium in our body exists in that extra cellulose fluid or interstitial fluid which has the biggest influence on the overall osmolality of our blood. So from an osmolability point of view I guess that's one of the biggest potential uses of sodium replacement during