Yeah, I tried to move them about over my arm, thinking exactly the same thing as you just did. It gave me all kinds of results. Another commentor points out tha

Yeah, I tried to move them about over my arm, thinking exactly the same thing as you just did. It gave me all kinds of results. Another commentor points out that the data is 'demo only' data on the in-store watches. The reason for demo only data is that the data might be considered 'medical' information and, I assume, therefore covered under HIPAA. Exposing that to just about anyone that can come in the store and see the record of the bpm is, rightly, very illegal and unethical.