How can I use math.random or random.new to select an attachment?

I’m trying to make a tornado/hurricane by swinging around a ton of parts in the air, however, it gets very laggy once they start clumping together. I though I might be able to fix this by having each part choose a random attachment on the rotating part. But, I math.random and random.new both return numbers, so I don’t know how to choose a random attachment.

local instances = workspace:GetChildren()
local randomChild = instances[math.random(#instances)]
print(randomChild)
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