Same here. Even walking 20 minutes every morning is nice to start a day. Now working from home requires some discipline, and I compensate it with doing a spontaneous jogging during a day.
Exercise and sunlight before work has done wonders for my mental health while working from home.
I'm lucky that the first part of my commute through green areas — I can ignore the second part through a congested part of London now that I don't have to end in the office.