Thanks everyone for your whirlpool comments. JH brought up an interesting point, heat to make tissues stronger. That's something that comes from the energy medicine proponents. The concept of encouraging the inflammatory process to speed healing. I guess in a round about way IASTM & ART would fit into this category. If you want to get more into the topic, check out James Oschman's "Energy Medicine in Therapeutics & Human Performance".
For the record, I am very skeptical.