To me it's heading towards better engineering of fitness equipment. I'm guessing there's some modern magic behind these with sensors and computers adjusting the resistance. That's why they're coming...
There is https://vitruvianform.com which claims 400 lbs of resistance. It's down to the motors that slowly pull on you to simulate the weight. It's easy to imagine on the eccentric but on the...
People have the space in most cases. 90lb Powerblocks are equivalent but less compact. A foldable power rack Rogue is making now would fit. You can fit a 300lb weight set under the bed and have...
I assume you'll be using bags that can be emptied and folded flat. Put a bunch in a big book bag and it's the same product as some sandbags but with water.
...