My friends and I are restoring a house built in 1909. The people that owned it before us did some... interesting things to say least. One of the things they did was lay a plank subfloor running parallel to the support beams on the second floor. Some of the planks have absolutely no support at all they way they're laid and there's a wood floor, either hard wood or laminate of some type, glued to them. Everyone living in the house practices martial arts of some form or another so we'd like to use this room as a practice room. We know what to do about the support beams to make sure they can handle the added stress, but what about the subfloor and insulation? What type of material would be best to redo the subfloor with? We need something that will handle the stress of having a 180lb adult landing on it with some regularity. We were thinking about oak or another hard wood what not really sure. Also, what type of insulation would be good for sound proofing the floor? We know nothing is going to completely dampen the sound of us throwing each other around, but we're hoping to lessen it somewhat if possible. Any suggestions at all would be helpful.