One mans &quot;Snooping&quot; is another mans &quot;breakout feature&quot;.<p>I&#x27;d be interested in a set of headphones that do heartbeat tracking for when I run... I don&#x27;t like wristbands and I haven&#x27;t ever really been interested in watches.<p>As with anything, it&#x27;s a tool in the toolbox to be used for good or ill...