title: How do you detect Workout start / stop with HealthKit?
body: <p>I'm looking for a way to detect workout detect / stop using HealthKit and it seems there is no way to detect it.</p>
  
  <p>In Android you get "ACTION_SESSION_START" and "ACTION_SESSION_END" for sessions.</p>
  
  <p>Has anyone tried detecting workout start / stop?</p>
  
  <p>Thank you for your time!</p>