Back problem

[Confucius]

My lower back is fucking me in the ass... Wait, what ?

---Some info in no particular order :

My max squat is 60 kg (132 lbs). My lower back doesn't feel anything unusual, just normal burn.

If I start deadlifting more than 30 kg (66 lbs) I feel something is wrong with my lower back (as in, it's weak and if I lie down it hurts). I stopped and just tried doing the motion of single leg straight deadlifts without weights and it felt exhausted.

Hyperextensions feel wrong too.

I am going to see the doctor in about a month.

My brother and I have this morphology where the S shape of our spinal cord is a bit too accentuated, a doctor told him it could be cause of some pain.


---Question :

Am I fucked ? Any exercises I can do to strengthen it ? I was thinking swimming a lot but meh.

[Rahf]

No, don't heed any advice from us. This is not something that people could recommend exercises for without it being possibly harmful.

Take your time, see the doctor and stay away from that pain in the meantime.

[Jackamaideshwang]

Dude, it just sounds like it's lordosis. You're tensing your lower back too much in your squats producing too much of a curve.
Just focus on lifting your chest by flattening the thoracic curve when squatting and deadlifting (should feel it tense about midway up your back on either side of the spine) as your lower back is already pretty extended so you wont have to worry about it much at all, and you would'nt have had the "but wink" problem. You may have tight calves, causing you to lean forward too much to try to get depth in squats, putting more strain on your back and if your glutes aren't firing during the movements (which would explain the low max squat) also putting more strain on your back. More hyper extensions are the last things you want to be doing as your muscles around your lumbar vertebrae are already really tight and it just aggravates them and makes them spasm more.

If it is what I think it is, you should fix up your posture, get more of a posterior pelvic tilt, and keep your chest up, extending the thoracic spine more, also be careful when sitting, make sure you keep that posterior pelvic tilt and chest up. Get your lumbar spine(muscles around it) area massaged(or do it yourself with a tennis ball or something) to help release the tight/spasming muscles and mobilise it to help get that posterior pelvic tilt. You could bring your knees up to your chest as far as possible untill you feel a slight stretch in your lower back and keep them up untill it releases. Standing up and touching your toes, allowing your lower back to round and stretch may feel good also. Maybe some twisting stretches could help like bringing your knee accross your body and twisting the other way.
As I said before you don't really want to strengthen your lower back just yet, you just want to release it. You could however strength your transverse abdominus and rectus abdominus to help you get that posterior pelvic tilt. You will also magically become taller. I'm not qualified at all though, so Rahf's warning may be advisable, but it may ease some pain untill you can see the doctor.