Heath and Hot Water: The History of Nature's 'Hot Tub'
The history of our modern day hot tub dates back to a geological oddity. Natural hot springs, as this post from AQUA magazine points out, were the inspiriation for what we now think of as a hot tub. Loosely defined as emergent ground water that is heated geothermically, these hot springs occur naturally on every continent in the world. Its no wonder that these relaxing, theraputic bodies of water inspired this phenomenon.
Here is an excerpt from the post: