Am I using too much weight if I have a significant arch in my back at the bottom portion of a push press? I’ve been gaining a lot of strength on this exercise lately, but as I add more and more weight, I can feel the muscles in my back not liking it.
I guess it depends on where the arch is. You should be able to brace your core and produce that arch with your thoracic spine.
http://youtube.com/watch?v=7erVblY7aiU some of the greatest had a huge arch, and they could move a lot of weight!
Try lowering the weight a bit