swing on rings

i found this exercise on this page at "support swings",

http://www.drillsandskills.com/article/17

does this exercise be helpful for any skill?

Coach likes it, it is part of the IC progression.

i saw in this forum a post of gregor who explains the swinging support hold..but i don't think that is the same exercise as i post...

Gregor talked about two versions.

One is where the rings are swung back and forth and you simply hold support. The other is swinging while in support. Support swing to HS is a hard C in a category where there is nothing easier. Darn tough SR group.