Personally I do 10-15 minutes of yoga/stretching after I get out of bed, no matter what time I’ll get up. This adds up in a week so that gives me some exercise on a total weekly basis.
If anything just ease into, start lightly and dont test your limits. Maybe just do a walk or light run half-way from your commute back home? I do that sometimes, too. It’s a nice mental break after work and you have to shower and eat anyway.