Balance in all things is a well known principle for healthy living. It is a basic law of nature. Floating rebalances the imbalances arising from day to day living both mentally and physically.
Figuratively speaking, floatation therapy "holds" your body for you, so that your mind is free to take care of much needed business. In many ways, it is no different from running a "disk cleanup" on your computer so that it performs better & faster.