I am looking for some specific exercices for fingers, hands and wrists to improve the flexibility and not the strength. This is because I suffered of a bad tendinitis mostly to the flexor tendon of the third and fourth fingers of both hands after playing many years the piano in the wrong way.
At the moment I am looking for totally relaxing and flexibility improving exercices only for hands and wrists. I know some very famous books, like Bob Anderson's "Stretching", but they do not include thorough hand, finger and wrist specific exercices.
I think that what is needed now is to improve the flexibility of muscles and body tissues, especially the membrane of the tendons.
Does someone have some tips? Some suggestion about relevant books or guides?
Thank you very much in advance!