I applied the patch to the inside of my left forearm. Next, I went to the gym and warmed up before running a 10 minute mile and then finishing with a cool down.  as my workout was finishing the patch started to show some color. I opened the Gatorade Gx app, created a profile, entered my work out information, and scanned my patch using the app. I ingested about 16 fluid ounces of Gatorade while I was working out. My fluid loss appears to be about 12 ounces, which means that I am meeting my hydration. It was very easy to use and I am looking forward to testing it out with another workout soon.