See here:
http://vimeo.com/ondemand/frontsplitsprep
If you want front splits with square hips and minimal lumbar extension, you need this program. Buy Liv a cup of coffee!
I will be posting on this pulse technique in my 90-day challenge post. It developed out of the ballistics protocol (and I am still using this approach for some exercises) but for some of the more subtle things one wants to enhance (and awareness is much enhanced with the pulsing compared to the ballistics) this is the way to go. More over at the other thread.