Initially, I thought the Sweat Patch was going to be so cool! Everyone loves instant gratification and that’s what I thought this would be. Work out hard, and you get to see your patch! I worked out for 40 minutes and nothing registered on my patch! I’ll admit I don’t get very sweaty, but I was definitely working hard and my skin felt damp. I didn’t have beads of sweat rolling off of me though, I never do. So unfortunately these may only give you cool results if you REALLY sweat it out.