run the same exercises each week for multiple cycles
run the same exercises for one cycle and switch it up the next one
choose new assistance work each week
Bonus question
Should you run the same push/pull/leg assistance exercises every workout or one set for each day?
I want to run the 531 beginner program from the wiki but it is a bit unclear about that. They just say to not overthink it but I would like to do it right.
Hmm, I thought the wiki provided more guidance than that. In any case every program I've seen has you run the same accessories multiple weeks and uses progressive overload, usually increasing the weight or reps as you can to drive growth.
I'm not sure I understand your bonus question. Can you rephrase?
option 1 or 2 is likely better. New exercises each week makes it harder to track if you're progressing. It's doable, and certainly keeps training sessions fresh, but I think most people would avoid it.
Honestly, I don't change my exercises much, or ever. I have a home gym, so already limited in what I can do. But there's only so many quality exercises. You don't need to always be changing them.
Should you run the same push/pull/leg assistance exercises every workout or one set for each day?
Exercise variety is good. Doing the same thing every day might lead to overuse issues.