It looks like that the 45-degree and 60-degree incline bench presses are "close enough" to the shoulder press that they destructively interfere, so something needs adjusting in the split schedule for the dumbbell exercises.
The core exercise block is currently:
- crunches: 30 reps (i.e., no strength building, just maintain endurance)
- oblique crunches: 30 reps
- bicycles: 30 reps (had to recondition this, first day was short). This is an augmented oblique crunch. The limiting part of this exercise is a static hold of neutral lower spine. This exercise was adapted from Pilates, where the recommended reps is six.
- Russian twists: This is in strength building mode; bodyweight is currently about 75% of my estimated 1RM. This is another augmented oblique crunch, and involves a dynamic hold of neutral lower spine. It's even more taxing on the lower back than bicycles.
The plank exercise block is non-optimal and I haven't quite worked out correct footwear for it yet; the compression socks don't give enough traction for either mountain climbers, or commando rows.