Andrew Huberman· PhD
You can do a more consumer grade version. Gatorade has a patch. For 25 bucks you can get two of them. You can put that patch on your left forearm and download the Gatorade app, and you can do a workout, measure it right there and click it over, and they'll tell you exactly, not along high or low, but again, they'll tell you the milligrams of sodium that are in your sweat, and then you can figure out, again, kind of high, medium, or low.