Hello All -- I have a couple of very active kids -- b/g twins who will be 4 in Sept. and I am going to go crazy unless I figure out an alternative to their jumping from one piece of furntiture to another -- they are nonstop. And this is after I take them to the playground! I am thinking of some piece of climbing equipment or bean bag or something they can jump/climb/burn off steam with in the apt that is relatively safe. I saw these interlocking foam shapes at the Science Fair last week at Washington Square park but can't seem to find anything like it on line. I am also considering some kind of contraption for the doorway. Anybody with any solutions/experience with this? Much appreciated.