Feeling irrationally anxious and not much I can do about it, so I popped in the gym for 3 sets on my machine circuit before lunch:

Session 58:
leg curls: 20x 50# easy
leg press: 20x 210# medium
overhead press: 15-20x 30# hard¹
arm curls: 15-20x 30# v.hard
ab crunch: 12-15x 90# moderate²
arm extension: 20x 30# easy³
chest press: 16-20x 50# moderate

1. On the 3rd set on overhead press, I ran into that nasty sensation of something twanging or grinding in my right shoulder. I think I've figured out what it is; the underdeveloped deltoid strumming on the shoulder bones. At 30# I could catch up all the weight on my left arm, and ease my right out of the pain. I focused carefully on proper form (shoulders back, abs tight, chin slightly tucked) but on retrying, I had that same sensation and had to dodge my right arm out of the motion again. So I stopped and moved on to my next machine. When I returned at the end of the 3rd set, it was no longer an issue, and I whipped through a good 15 reps at 30#.

2. Lots of reps at low weight on ab crunch is called "sit ups", which I can do at home. In fact, I woke feeling spring-y this morning and did a good 25 crunches before coffee and another 20 sit-ups before breakfast. So as long as I'm doing lots of calisthenic ab work outside the gym, I'm sticking with challenge weight levels for abs during machine time.

3. Might step up to 50# on "high rep" days and shoot for 70 on "high weight" days here