[trux]

1) Yes, as we already wrote - packing stretches will help. Also plain rib cage and diaphragm stretching exercises will help

2) Yes, we had an osteopath studying the effect on several members of our club. However, it was rather focused on increasing the maximal pulmonary volume, than reducing the RV (though it is certainly related). Generally, there was some increase of the volume, but the difference was behind the results at swimmers or athletes. Probably because most freedivers already unblock themselves better (due to training, relaxation, and stretching) than sportsmen in other disciplines. Unfortunately I did not participate in the project, and did not see any written results of the study, but will try to find out if I can still get into contact with the osteopath to ask about it.