David Gorman recently presented the following experiment on the Alextech
list, and has given permission for it to be posted here. Feel free to send
feedback to me privately (I'll summarise the results without naming names),
or you can post any observations here on the list.

Stand up and come to your own normal standing, as you would do it
"without thinking".

Note where you are in your contact with the floor (more to front,
more to the back, more to one side of the other, or more or less even).

Then come to an even distribution of contact, as much to the front as
the back as much to one side as the other.

Now go back just enough that you feel more contact to the back of
your feet than to the front, then go back to even distribution of
contact again. You will probably not have moved more than an inch or
so back at your head level to feel this contact change at your foot level.

Now from the even distribution of contact go back again that same
amount until you just feel more to the back of your feet and notice
what happens within you when you move back that little bit. Most
people will feel various grabbings and holdings suddenly occur when
they move back, usually around their knees and sometimes in their
abdominal area, and so on, depending on your use. If you go back even
more you will feel more protective muscular activity and/or
compensatory postural activity (bending, arms reaching out) to
maintain balance.

Now come back to an even distribution of contact again and move
forward just enough to notice more contact on the front of your foot.
Again notice what has to happen within you as you move forward. Move
forward more and notice how much more has to happen to keep you from
falling.

If you do take the trouble to play with this, see if you can find the
place/area where you have the least of these "balance reactions"
happening and what your contact with the ground is like then.

I do not see any percentage in telling you what to find, nor the
meaning of it as I am sure you will all find for yourselves what you
find and interpret it the way you will no matter what I say, but it
can be instructive to play around with it to see what you do notice...