Some time ago, I conducted a class for advanced  and black belt students.  A couple of advanced (brown belt) pupils asked me  about training more rigorously towards the coveted black belt grade and I agreed  (enthusiastically, I might add) to focus more one-pointedly on their  training.  One of the requirements I am demanding of them is  this:
By the end of May (which was about two months away),  you must be able to stand in a floating back stance (also known as a  seven star stance, this position involves advancing one foot with the  toe raised), bend over, and touch your elbow to your toes.
     Yep.  They had about 8 weeks to get it  done.  That means they'd have to stretch a LOT every day.  Every  day.  Way back when, many kung-fu teachers wouldn't teach a pupil at  all until he could do this.  Some required that you be able to place your  foot on a stretching bar (about the height of a table or counter-top) and touch  your chin to your toes.  True story.
     Fortunately, my teacher wasn't quite so  demanding.  He only insisted that we be able to stand up straight and touch  our palms to the floor (keeping the knees straight).  Most of my current  students can't do this but even at my age, I have no problem doing it.  So  there.
     There are several reasons for my  requirement...
#1: It lets me know  who really wants to learn and who doesn't; which students are willing to do  whatever it takes to learn, and which ones aren't.  To be able to  accomplish this stretching feat will require a great deal of daily  practice.  If a person can't or won't put out the effort (and endure the discomfort) required to achieve it, they certainly won't put out the effort required  to learn advanced material (to develop real kung-fu).
#2: It will  physically prepare them for advanced training.  Unless one maintains a  certain basic level of flexibility, one's speed, and hence, striking force, is  seriously impaired.  Some advanced techniques and postures simply cannot be  performed at all unless one has achieved a pretty fair level of physical  flexibility.
#3: It will teach  them (the truth of) one of the great secrets of martial arts and life.  And  that is this; "To have a flexible body, you must also have a flexible  mind."
     Sounds simple enough, doesn't it?  But  think about it...as you think, so you are. 
"As a man  thinketh, so he is."
-Gautama  Buddha
     How you regard yourself, so will you  be.  How you think impacts not only your behavior towards yourself  and others, but the condition of your physical body...and the realities,  both physical and abstract, that you create for  yourself.
     A person who is mentally inflexible (decide for  yourself what that means) is, by and large, going to be incapable of being able  to perform this stretching feat.  This does not, however, mean that he can  never achieve it.  If he will "stretch" (ie., loosen) his mind, as it were,  he will be able to do it...with some considerable effort.
     This simple exercise demonstrates how the way  you use your mind affects your physical reality.  If a student REALLY wants  to learn and manages to succeed in doing it, he will learn HOW to use his mind  correctly.
     This is a great secret.  Actually, it can  be said to be a great secret technique.  It isn't at all  complicated and requires no real coordination, timing, or any of that sort of  thing.  It isn't hard to remember, either.  But how powerful it  is!
     Oh, yeah....there are no short cuts short of  severing the tendons behind your knees.  
     Severing the "short cuts" in your mind is less  painful.
