Its kind of wild that you should bring up the "crab" position. A few years back one of the Gracies showed how to get up from the "crab" type position.arnisador said:I've been taught both to get to one's side and sidekick, and to get to crab position. I prefer the side position. In any event, one must keep moving to keep those feet toward the opponent!
From the crab: 1.) place one hand on knee
2.) create diagonal stability with foot and hand on ground
3.) slide opposite leg between foot and hand
4.) create three point contact
5.) release hand off of knee and raise to standing position.
The advantage of this position is that single and double leg takedowns are possible plus you can quickly protect your melon.
Sorry for the crappy description. I am trying to think through the steps and am having a terrible time with it.