Ive gotten my form checked numerous of times and its been fine. I do mobility work as well since i play a lot of basketball and want to be athletic as possible when jumping. Thanks for all the input so far.
Good find Rds. Luckily ive been do A2G squats so i might just stick to that.[/quote]
I had this exact same problem years ago, and it was due to relatively weak glutes and hamstrings and tight hip flexors. ANYTHING involving the lower back, even for stability, even with running, caused an uncomfortable pump and tightness in the lower back.
You most likely have the same thing going on. I solved my problem with mobility drills and glute activation drills–particularly bird dogs, lying hip thrusts, fire hydrants, toy soldiers, but kicks–and static stretching for the hamstrings and hips (Warrior stretch helps a lot with this, and single leg exercises such as stepups, single leg RDL’s, and lunges.
ART and massage can help.
Also, staying away from posterior chain exercises that target the lower back such as hyperextensions, low bar squats, and good mornings for some time helped too, as I relied more on safety bar squats, front squats, trap bar deadlifts, sumo deadlifts, and glute ham raises, until the problem resolved too.
Do you lift for recreation and play ball for some added activity or do you lift to get better with conditioning for basketball?