Core failure?
How close to 5RM were?
OHP (assuming you are standing) can definitely tweak your lower back if you are not squeezing your glutes/core tight.
On the barbell row, are you falling forward or backwards frequently? Heels lifting off ground? Back rounded?
Are you lifting in flat shoes /barefoot?
I meant to answer this yesterday. I don’t think it’s core failure because it was all upper body. My guess is it was barbell row. Probably rounded my back.
Normally I row in the squat rack and pull off the safety bars at the lowest setting. I pulled off the floor today so probably thru off my technique/form. I do 4x8 and I hit like 8/7/7/6 or something like that. Pretty normal when trying to progress I’d say. Feet stay on the ground.
OHP is standing military press. I’ve been stuck at the same weight for awhile so I did nothing different than usual. I do forget to flex glutes most of the time.
I work out in some old Nike running shoes.
Starting to feel a bit less sore. Going to machine row today and machine OHP to make sure I completely heal. Last time this happened I just kept working out thru it and never healed.
Will replace squats and Romanian deadlifts tomorrow as well with some lunges.