Check-in with yourself every 30 minutes:
How does your body feel? Have you been outside today? Take a break for 20mins. Close your eyes and take 3 long deep breathes. What is your posture like, probably needs a little adjusting? Are your shoulders down? Are you clenching your jaw or grinding your teeth? Frowning? When did you last drink some water? Get up, walk around, do some stretches and then get back to work.