@davecb I feel better reading this. As a middle-aged, sedentary, newbie looking to build a habit, I've started an extremely pared-down RR. My intention is to fill out the pieces over time to be a proper RR over time, but my initial goal was simply to not break the habit of 3x per week over the course of a few months, while having measurable progress (or at least lack of regress). Having a superminimal time commitment is helping me towards the habit goal. I installed rings in my house and so I (currently) need no more than 10 minutes three days per week, just before my morning shower: no changing, no driving to the gym, no overhead beyond putting the rings back out of the way so that the laundry machine isn't obstructed.
So I'm balancing push (push-ups, now close push-ups on rings) with pull (rows on rings). And I'm doing bodyweight squats. I'm missing the L-sits, so I'm doing a mini-circuit of the three. With the addition of the third exercise, there's basically no rest between exercises, though I'm not pushing myself. The point is, that by the time I get back to an muscle, it has rested.
My next step was to add the bodyline drills, but probably on alternate days, so that I was spending 10 minutes (most) every day instead of every other day. I've already started gentle experimentation with the static holds skill work, and will formalize that properly at some point. I'll add the L-sits after that, I reckon. I'll add the vertical pull-push pair when my horizontal pair is ready (pull is lagging behind push, as is probably true for many dabblers).
I felt safe: I pace myself so I never feel like I risking injury. But I was concerned that I was blasting ahead to the strength exercises without either stretching or warm-ups. I'm reassured to hear that someone estimates my chances at 95% of being okay. I will add the stretching and warm-ups as well, I just want to keep the habit locked down as a priority.
The other thing I got from this discussion was the possible advantages of lunges over squats. I had been doing 3x8 step-ups each side, but I regressed to 3x16 squats because my balance sucks and my knees seemed at risk. (The step-ups were thus more dynamic and less controlled, and I was either cheating with my back leg or feeling stress on my forward knee. I can do the squats slowly with few risky knee feelings.) But I can see that lunges can help with balance, which is another subgoal. And I can see that they can be done slowly.
TL;DR: Good to know that for a minimal habit-building routine, minimal warm-up is needed.