Maybe hydrotherapy works well because the human body is about 70% water. This is something that has been used for things like stress and anxiety as it effects the body and other issues. One thing to remember with it is that there is no one size fits all approach with it. Here are some of the interesting and useful applications of hydrotherapy.
It's not like you'll be a tub of water up to your chin or anything like that - it merely depends. Have you ever soaked your feet because they felt tired and hot, if so then you were employing one form of treatment. Perhaps you were just on your feet all day and especially if it's part of your job. Placing your feet in hot water for a few minutes, or even a half hour, can do a lot to make them feel better. You might also want to buy a foot bath massager, which adds massage to the already relaxing quality of a foot bath. One of the worst things you can do if you suffer from arthritis is nothing - meaning, not being active at all. http://www.onlinetherapy.io/
If possible, join a swimming club where you can go and just be in the water and gently swim around. This is becoming more popular, so you can look it up on the net or in your yellow pages. If you can swim, then you will be giving yourself a great workout.
There are lots of methods to achieve a hydro-therapeutic effect, and the whirlpool is one of them. There are so many different kinds that you can place almost anywhere at home. You can find these devices in a huge variety of designs, so just shop around and find what you like. Nozzles that can be moved around to displace the water on your body may be what you want to get. Maybe you have a friend who owns one, and you can ask for test drive. Hydrotherapy is a form of healing that has many different applications. This is something that almost anyone can get some benefit from. This form of therapy is usually very good for most people. However, if you do have a medical condition which requires you to avoid extreme water temperatures, this is something you might want to avoid.