I heard from a friend of mine that this seasons Biggest Loser will be using a new kind of pool that is an underwater treadmill. I read alot about this in a few university storys awhile ago. The only exsisting underwater treadmill is created by a company called Hydroworx. I googled them and found their site (www.Hydroworx.com) They are a company located out in central Pennsylvania. They make two kinds of underwater treadmills, the 1000 and 2000. Seems like the 1000 series is for a single person while the 2000 is for about 2 or mabye 3 peeple at a time. I would be guessing that this seasons biggest loser will be using a 2000 due to the weight of the people and if they choose to add more then one person. I don’t know anything else but I’m quite certain due to a friend of mine who works at nbc told me this info.