Uhm, I would have to say the abs cause once that is fractured your bending backwards and shit lol.

Lumbar hands down. One minute you're winning, the next you're doing a snake impression.

Chest and abs. Can't handle shit.

Irl; Your spine. Fucking horrific.

Tb; Either your chest or knees since it makes controlling tori x10 harder.

What's so bad about fractured chest and abs?

Shoulders.

Yes. Pugsa has the right idea!

It all really depends on what mod you are on.

If you are playing wushu, having fractured hips could be the difference between winning and losing because you can't get back to the other guy after the main clash.

In aikido I found that the worst spot would be the shoulders

Fucking Lumbar. You're just twisting around and shit while your opponent just sits there and watches.

I hate when my spin thing is broken because then I can't spin