Well, I was able to tolerate it the first few months. But today, it was really worrisome for me. Aside from the fact that the dropping noise were louder (they probably increased the load of their barbell), my anxiety got worse too. I can't relax because I am afraid of them being unable to hold/lift it with control in case.

What should I do about it? I get that they want to workout at their apartment. But there is a gym nearby and it is really cheap, too. I would not mind if they are lifting just around 30-50 kg. That would still be scary if they accidentally lost grip. But not as scary if it is around 80-100 or more. I met them once and asked them stuff when I newly moved in and have taken a peek at their room. They have so much equipment and I was fine with it. But it has been too much lately.