So I've been working with just the shoulders back and down but could never get the hang of getting my legs into the lift. Recently I've had the pleasure to get some tips from a living legend at my gym who used to almost bench 3x his bodyweight and he's been helping alot with form and I can get some nice leg drive but obviously my arch is much more pronounced that before and I can feel the tension on my back/lower back during the lift and then after and sometimes if its a heavy session the day after. My question is am I damaging my back at all I mean I know nothing is completely 100% safe but am I gonna be messed up later in life because of it. I don't really know how to put it in words but I'm willing to make the sacrifice if its just gonna be uncomfortable and not do any real damage but if I'm gonna really **** something up I probably will change it. Any and all advice on this topic is welcome. Thank you and God Bless.