@iaretyler doing 5 warm-up sets should be sufficient, no need to do more than that unless you are warming up to a 1RM.
Glad to hear your back hasn't been hurting lately! Hopefully that is a sign that the APT exercises are working and everything is on the mend! ðŸ‹
@Scott_Herman Thought I'd give you an update. Yesterday I took my time with the rack pulls and did 5 sets of warmups, with about 50+ pounds between sets. Overall, the pain was not there like it was the other day. A few times I felt it start up on the first rep of a set - put the bar down, really focused on my form and finished the set with no pain. Did the stretching in between sets too. So yeah it probably was my hip flexors acting up. Thanks for the help.