Joe Tomei here with an attempt to revive Funky Friday places. Today, I wanted to introduce a seikotsuin (整骨院 or osteopathic clinic) called Cure. It is located next to the Kumamoto Suizenji Athletic Ground and has some parking spaces behind it. They specialize in sports medicine and as I had a pulled muscle, they gave me a course of electric stimulation to the problem muscles, heat lamp and then a pressure massage. The first time is 1,980 and later visits are cheaper and if it is related to an injury, you can file for reimbursment with your taxes (70% of the cost I believe)
The owner and staff are young and very cheerful, I did it all in Japanese, so I don’t know how accessible it would be if you spoke no Japanese, but pointing and Papago go a long way!
Hope some other folks can talk about their recommendations for these sorts of places in the comments!