I have recently gone back to lifting due to a shoulder (acromioclavicular) injury, which is mostly rehabilitated now; I feel some inflamation after hard BJJ sessions but it isn't painful. I can do some lifting 3 times a week. Gym equipment isn't the best or most appropriate, and I can't switch gyms since I train BJJ there, plus I'm a cheap rat I guess. I have tested the exercises, squat and deadlift, to see where I'm at and the numbers are depressing. I could barely deadlift 154 lbs (Yuropean here, I'm converting the weights, bar unaccounted for since it's not an Oly bar and I don't know how much it weighs, less than 30 lbs for sure) for 5 reps without resting due to my lower back being really weak. I tried squatting the same weight and it wasn't really a problem. I'm 6'1 @ 203, around 20%bf. My intended routine is a 5x5 - Deadlifts or squats - Bench press or dips - Military press - Rows - Add pull ups and chin ups down the line. How do I specifically strengthen the lower back since it's my weakest point? Should I assume it's not just my lower back but my core that is underdeveloped? How to fix it so I can start adding weight? There was a time I could DL that same weight for reps like it was nothing. :'( Thank y'all. Advice on better routines is appreciated, the problem is the gym doesn't allow dropping the weights so I can't really do Oly lifts.