Check out this course
Mind Control: Managing Your Mental Health During COVID-19
Made by a professor at the University of Toronto
For me, I put on podcasts or audiobooks on light topics like the brain or history and work out by doing air squats, push ups, off my knees if im tired, so, it's kind of like going some place mentally, and getting a light workout. Sometimes the best are dynamic stretches, like the cat stretch or side stretches back and forth, whatever feels good do it.