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Powerlifting is incredibly healthy. For anyone interested, pick up a copy of Starting Strength. It's an amazing read. I've also really enjoyed StrongLifts 5x5 - it has a companion app that tells you exactly what you need to do, each workout.
Seconding the recommendation of Starting Strength. Fantastic book - lots of interesting writing on anatomy and leverage and why certain techniques are better. I also really liked the fact that most of the people in the photos are distinctly ordinary, rather than super-fit well-muscled models. And yep, beating your numbers is great motivation, and one that really appealed to my gamer self :)
I'd had a couple of people tell me that my squat form was poor and that I was going to injure myself, but I found it impossible to figure out what was going wrong as I had no feedback loop. Once I could see myself on video, I could try different techniques and see how they affected my form. Starting Strength has a lot of writing on how to recognise and train good form, so once you can see yourself it's not too hard to correct.