I have occasionally mentioned on this blog my recurrent back spasms. Occasionally I get a back spasm. Usually in the quadratus lumborum. It has been going on for years since a deadlift workout in about 1992.
When I am injured - and I've had a couple of episodes this last couple of weeks - all this stuff about exercise and conditioning goes into the background. The focus is on simple movement. Just to be able to move freely and without pain is sometimes a great blessing that we can take for granted.
Skill sets start with being able to walk, sit, get dressed. When they are in place then the essentials are there!