Any advice on how to protect wood floors...

[CandidCam]

from accidental droppage of weights? I just purchased a Cathe DVD, but now my DH is really discouraging use of heavy, non-coated free-weights or our barbell in the house, since we have soft, Pine floors.

Can anyone recommend a really good, inexpensive solution? I did purchase some black, interlocking foam tiles from Wal-Mart, but DH is not convinced that a weight wouldn't go right through that.

TIA,
Kirsten