My student is getting exhausted, and looking at a screen all day isn’t helping:

1. Send them outside for at least 30 minutes.  There’s an incredible article here about the way nature reduces anxiety.  
2. Consider having them back away from the computer screen (at least two feet)  if they aren’t having to interact with the Zoom call.  
3. Set up a standing desk.
4. Have them work through one of these mindfulness exercises before, during, and after class.
5. Have them set aside a portion of time, each day, in which they do not look at any screens (phone, tv, etc.).  Reading is a great option!