This is the accompanying video for a tutorial that I wrote for the November 2008 issue of 3D World magazine.
No audio I'm afraid as this was supplied to the publisher for illustrative purposes only. However, you can find detailed step by step instructions here: andynicholas.com/?p=1549
An example animation can be found here: vimeo.com/34582767
Please note that in versions 8 and up of XSI, the spring simulation values need to be changed from what you see used in this video. You'll need to change the spring constants from 14 to 80, and change the spring damping from 1 to 6 to produce good results.