Disclosure; I received this product free for testing purposes. The patch was super exciting to use. It applied and stayed stuck to my arm with no irritation the entire work out. I must be a light sweater as it took about 75 minutes to minimally collect enough sweat to analyze. It was a little difficult scanning the patch to the app but eventually it worked. The app was easy to use but did have a glitch when I was trying to make my own account, and took some workarounds which was frustrating. I was super excited to analyze my sweat because I’ve always wondered how to maximize recovery from workouts and how much I should be drinking and how many electrolytes I should consume after a good sweat session. The patch said that I lost 0 mg of salt during the work out which is really surprising to me and makes me question how accurate this app is. Overall though it was cool to see how much water I lost during the work out and the app give personal suggestions on work out recovery and planning future fitness activities. i’m excited to retry the second patch and see if I get the same results.  regardless of the accuracy of the patch, he definitely motivated me to work out harder and was super fun to use.