How Much Salt Do I Need to Replace?

"I originally started off playing around with this equation just as a bit of a thought experiment based on some of the stuff I was seeing in the lab" "It wasn't something I had done before and I had run a few scenarios through that so I looked at a soccer match, an elite marathon runner and then a 100 mile ultra marathon runner to look at the impact of different sweat rates," he says. 'When I graphed it that way I got some really interesting patterns starting to emerge in the data that made things sort of predictable in a lot of ways'