Sound Proofing Hardwood floors

[Austin Haynes]

I currently own a up and down duplex and am house hacking it. I live in the downstairs unit because it needs more renovations and I am treating it as a live and flip. The upstairs unit has hardwood flooring and you can hear when someone is walking around. Does anyone know of anything I can do to help sound proof the floors? Thank you!

[Bruce Woodruff]

Unless you're going to a) take up the floor and replace it, or b) open the ceiling below and pack in insulation, or c) put down carpet upstairs, then not much you can do.