For the past month or so I have been trying to increase my squat by 5 pounds every week. I do full squats and aren't really new to them since ive been doing squats for about a year and a half regularly. Well my past two squat workouts i did 5 sets of 3 reps and my back was in pain...not like a piercing pain but like a muscle stiffness pain for about 10-15 minutes after my workout. The day after I had no pain or soreness in my back. Im probably going to lower the weight but was wondering if this could be because of a weak back or poor form. I actually deadlift a little more than i can squat right now but am not sure if that constitutes a stronger back to hold the weight up. Sorry I don't have any videos of me squatting