Awesome, you got them all. This is definitely worth karma... must of taken a while.

The ankles are good for making your kicks hit more nicely...
Contracting Glutes is essential in some really good jousting moves...
Contracting Abs will give your kicks more of a, erm, kick...
The neck I've found isn't too useful, but it is a nice modifier if you need a slightly higher/lower punch...

P.S. I'm a master of headbutts... too bad I get headaches easily...