I started stronglifts a around 3 months ago and I squat fine with good form and technique from 20kg all to 80kg. But lately when trying to do 82.5kg I really had to work it and as a result I slouched and ever since my lower back hurts. Should I do some exercises or look at some medical advice?
I'm a bit reluctant to go to medical advice as the last times my knees hurt when I bent them they don't me not to do any exercises like squats. Days later I started stronglifts and now my knees are healthy


