I've been training pretty regularly for about a year now (StrongLifts 5x5), after training for a few months I started getting more and more pain in my knees and ended up quitting squat/deadlift until they felt normal again. I've watched hours and hours of clips on youtube on technique, read loads of articles and even got help from a personal trainer (who has pretty good credentials, I think at least) but every time I've tried doing the exercises I still end up with pain in my knees. I am not lifting heavy either, we are talking only 100 lbs and the pain comes creeping. I think partially the reason might be bad technique when I was younger (trained about 9 years ago with really shitty technique and only off and on again since recently when I started lifting regularly) and that I've possibly done permanent damage to them. Do you guys have any tips or something you'd recommend me to read or watch? I dont want to be the "skipping leg day guy" but I dont want to ruin my knees either.