For a few months out of the 3 years that I lived in New York City, I had really good health insurance that covered visits to a physical therapist who massaged my back and put these electricity-inducing patches on my back to ease tense muscles. Now, I don’t even have to go to the physical therapist or have health insurance to get these treatments. In fact, I don’t even have to leave my desk. This USB Mouse w/ Electrical Muscle Stimulation system helps work and tone your muscles while you sit and work. You can switch among 3 modes and 20 different speeds depending on how much of a "work out" you need.
Product page (Japanese)