I was interested in the theory that the lower
back stores up small injuries and then seizes
up to allow a "batch repair" by holding all
the muscles in a "rictus spasm" while this
occurs.

I am trying to get some confirmation of this
and there is nothing about it in the "Merck
Manual" though I will try to check out
similar books devoted to sports injuries and
physiotherapy.

In the meantime I have been given a series of
exercises to do such as push ups, sit ups,
leg presses and brisk hip-swinging walks
around the block.

We'll see how it goes. I do a lot of physical
work in my job such as walking, lifting and
climbing up/down ladders.

I have never come across the subject of
handedness such as being right or left handed
and the bias this puts on the body parts, and
if there are exercises to counteract this.
No medico has ever mentioned it.