Agreed on GS being on the opaque side!
Best thing I've read is Language in Thought and Action by Hayakawa. I found it explained the concepts much more clearly than Koryzbski's writings.
Drive Yourself Sane is meant to be an intro to GS and has good reviews. I can't remember much of it as read it >7 years ago, however I recall it didn't do as much for me as Hayakawa's book
This reminds me of the Ladder of Abstraction in General Semantics: moving up the levels of abstraction to talk about things in general, and moving down to clarify the details that make up each generalisation
Any exercise: generally bound to set length of time or distance (reps/lengths/miles/etc). Ideal lunch break fodder
Walk around block: not that interesting but a good break
Meditation: not as in-your-face restorative as exercise but still good
If co-working: organise breaks to chat (pomodoro or some other schedule). I find virtual co-working, ie video chat with friends or Focusmate/Ultraworking with strangers, is good really effective when working from home (more so with friends than strangers).