Curious as to why you'd avoid bands. They are one of the few simple things you can use to accomplish what you want and they're dirt cheap lol

I already have them. I'm doing the conjugate system and I need both 😂

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Chains are far and away the most readily-available, lowest-cost system for what you're looking to accomplish if you're not going to use resistance bands.

>the more they go up in height

Weight? Heavy industrial rope, cable?

Industrial Rope are a great idea

Well, you're gonna be hard pressed to find an alternative to chains, for their weight and even loading. Really you can hang anything from the barbell that'll progressively add weight as it comes off the floor, but chains are great due to the fact that they're relatively heavy for their size and provide a constant resistance change