Hi all,
As a point of interest, I just found this article by Ian Deavin in the Longfei newsletter, Vol. 6, Nos. 1 & 2. It describes some biomechanical models for applying and absorbing force. I liked the pictures and found the descriptions helpful.
Part 1:
http://www.longfei-taiji.co.uk/news/vol6iss1/models.part1.html
Part 2:
http://www.longfei-taiji.co.uk/news/vol6iss2/models.part2.html
Kal