Here's a way to save time and energy when repairing floorboards. Instead of drilling and chiseling damaged floorboards, use a plunge router. First, use a magnetic nail finder to be sure there are no nails in the way. Set scribe lines across the damaged pieces, then run the router across the boards for a quick, clean cut.
For more on flooring, consider:
Wood Flooring 101
Wood Floor Repair (VIDEO)
How To: Refinish Hardwood Floors