Yeah, my friend has one and got a note from FitBit 5 minutes after his morning constitutional. They asked if it hurt, as they could tell it was a little firm.Jessica uses FitBit. She tracks our steps each and every time we go out. But mainly she likes to follow her heart rate. I have one also but have not used it outside of the house. Was concerned when I started getting text messages from FitBit with stats from my nights sleep.