Sure, do the same now and then when I'm in my 30s and 40s I'll be enjoying the best pain killers and spinal surgery money can buy. 
So you are saying that these regular gymrat squats doesn't hurt your back at all?
What you brats should understand is that these examples are here because you should know that there is always the better way to do things. For example that spine - video which you linked: The message in that video is tell you that if you stress your spine wrong way, it get ill. It is quite stupid to think that proper form for squats make more damage, that that silly fucking wriggling that you call a squat. How about overloading a leg press, a hack squat for ego? No damage what so ever? We have great man to thank most of the back injuries in the gym, our hero, multiple Mr O Dorian Yates, who teach your blockheads to do bent over rows by standing straight up and yanking overloaded barbell up and down. Damages done by the squat are nothing compared to that
