Regardless of severity, unless it’s really not physically possible , I walk on the day it happens and every day after minimum twice a day. Even if not 100% vertically.
This time I am doing yoga cat, cow and child as well as knee rolls / stretches, nowhere near hamstring stretches yet. Very light leg conditioning by holding onto chair or something similar as additional pressure from back causes leg muscle issues.
I’ve ordered a new firm mattress (the existing one likely to be a factor) and now using a back support – this particularly helps for walking and sitting.
When there is a better period of the day, I am doing one set of taekwondo patterns without kicks – just lightly to practice flow. Don’t know yet if this is bad idea or not.