@mournfulwatcher Well, doing a 5 mins workout is better than nothing. When you got used to it, you can slowly increase the time.
While I am 100% WFH now, before MCO, I always reach home after 7.30pm. Then, first thing I do is force myself do simple workout. I don't have a dumbbell that time, so what I did was like, today push up 3 sets x 10 reps, next day squat 3 sets x 20 reps, another day something else, then a day rest, then repeat the cycle. Everytime it only took around 10-20 mins. Not too short too see progress on your body. But not too long to cause you more tired.
Nowadays, I feel weird when I even have the thought of taking a day off when I shouldn't.
If you are able to discipline yourself this way, I am sure you will be able to handle your work much better and slowly see your progress, not only in your career, but also your health.