Doing standing shoulder presses, I'm very cautious not to learn backwards during the lift. My training partner and I specifically watch each other for this.
However even without weights when my upper body is upright, my lumbar region is already hyperlordotic. It's something I've been working on eliminating lately.
Two days ago during my second standing press workset, something popped under my left shoulder blade on a rep I was having trouble completing and pushing too hard.
It didn't hurt but it didn't feel right so I stopped the workout. That night was agony though, as was the next day, but it's getting better now two days later.
During overhead presses, I can feel my core under enormous pressure, like it's trying so hard to stop that lordotic curve increasing. I'm currently shoulder pressing 125 pounds, which I've slowly worked up to in a 3x5 fashion, increasing 2.5 pounds each time. I failed to do three sets of five the previous week at the same weight, managing only 3, 5 and 5.
I warm up before lifting with about 15 minutes of Cressey/Robertson's Magnificent Mobility mixed in with some hip flexor stretches and foam rolling.
Should I go to seated presses, fix the hyperlordosis or strengthen something else before doing presses again? Or simply not strain too hard to finish a tough rep?