Apparently originally exercises was 9, and the methodology was different from what is in the version in Internet. I am seeking sources of these exercises. Can anyone recommend something?
Sources, history, methodic, varia of these exercises. I mean lack reliable information on this subject, because the web is just a set of exercises in many versions. In the popular description in the network is not information about the effectiveness of the exercises outside the visual effect, appropriate phase of the macrocycle for athletes and on the side effects and contraindications in the recommended methodic for 40 days of training. My own experience is a pain in the spine Th-L and a long time the lack of strength m. abdomen. I have not met any work on this topic.