So on safe movements like machines…..I’ll even go down to 5-6 reps for first set, backoff around 10-15%, and get 6-8 reps.
Barbell pressing or rowing, I’ll do 7-8 reps, backoff and try to stay 7-8 reps.
Legs….top sets in a good hack or smith, or a locked down seated leg curl, 6-8 reps, backoff to stay same reps.
Leg press, laying leg curl, split squats, 10-12 reps.
Shoulders, leg extensions, biceps triceps, rear delts, 12-15 reps.
Back- it’s so individual…..heavy as you can go and keep tension on the muscle you’re trying to grow. I suck at back MMC, so probably higher than most. Except krock rows…..2 heavy, ugly, chesty sets till the fucking thing isn’t moving