By Laura Forsyth I thought I had hydration sorted – drink water, with an electrolyte, and I was set. But after trying a sweat test from experts at Precision Fuel and Hydration, I realised I’d been overlooking a key area: sodium loss. The sweat test itself was straightforward. I didn’t have to exercise; instead, the team placed electrodes on my forearm to stimulate sweat. There was a slight tingling sensation, and once the sweat started collecting in a tube, I could see it happening in real time, then the results came in quickly. The main takeaway from a sweat test is your sweat sodium concentr…