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I haven't lifted very long, and I'm still pretty young. So far, I don't think I've done anything that will screw me up later on. I don't know if I'll even continue to such a level where I am actively moving very heavy weights, but as said above, I may as well go out with a fight. I enjoy doing this, and I will keep doing it until I screw myself up too badly, or if/when I no longer enjoy it.