• Keep the weight in the precise centre of the foot to the best of your ability at all times.
• Keep the abdominals and glutes relaxed at all times
• Do not hold the shoulders and head, just leave them completely relax and let gravity drag them downwards.  Done correctly this will feel something like the spine being 'drawn' from the back in the same way a sword is drawn from its scabbard.

The relaxation of the posterior chain sends the work into a deeper, dormant line of tissue which will respond with a 'protest' of some kind.  This protest is different person to person, but common expressions of it include rapid heating of the body, vibrations and fibrillation of the dormant line, and occasionally the arising of various emotional energies. Typically our body will experience this for a moment and then contract the posterior chain once more to draw the work back into known territory. It is the exploration of this unknown territory that allows the deeper properties of this exercise to emerge.  To dip into the turmoil and instability of these hidden lines requires a certain capacity to digest the experience, so take your time building up to this.  If one rushes into the shadows it will almost certainly finish with disaster.  Proceed gently and with caution, dip into the experience and get a taste and then come out once more.  Over time your capacity to stay in it will increase and you will be able to safely explore deeper aspects but this requires great sensitivity, patience and knowledge of our personal responses, all of which only come with significant practice.