From the posture of "Preparation" [Session 1 - Module 1] gradually raise your hands in an upward arc to finish with your palms facing your belly, as if "Embracing a Tree".
SHOULDERS RELAXED. ELBOWS DOWN.

If this were a tree that you embrace (or hug!) it would be a very small one - so you just may do better to visualise that you hold an inflated beach ball between your open palms and your belly. SHOULDERS RELAXED. ELBOWS DOWN.

BEGIN: As you breathe in imagine that this breath inflates the ball you hold against your belly or indeed, imagine that this ball is now your belly.
As the ball expands, allow your arms to open up a little to accommodate it.
On this in-breath also straighten your knees a little and raise up or 'expand' your whole body upwards and outwards - but never "lock" your knees.

Imagine then that you remove the air from the ball and you belly by stiffening you fingers a little and 'push' inwards towards your belly with you open palms to deflate the ball.
As you do this, sink at the knees a little and return to your starting position.
Repeat - a minimum of five times.

From the posture of "Embracing the Tree - Low" (as above) gradually raise your hands in an upward arc to finish with your palms facing the centre of your chest - keeping your SHOULDERS RELAXED and ELBOWS DOWN.
Imaging now that you hold the beach-ball in this higher position, breathe in and out at least five times, including the softening of the hands and the expanding of the whole chest and belly and raising up at the knees on the in breath and the hardening of the hands and the sinking at the knees on the out breath.

The exercises Embracing the Tree Low and High are formulated to aid 'internal' Chi development. In simple western terms, the idea is this: By taking good full breaths in we take in plenty of Oxygen to our lungs. This oxygen then enters the blood stream ... so we then have well oxygenated blood circulating through our bodies.
INTERNAL:The gentle movements of the Embracing the Tree exercise encourages the circulation of this blood first in to the 'deep' muscles and internal organs. With the two 'internal' exercises described above our hands/fingers are 'soft' or Yin on the in breathe and we make them 'harder' (but never 'stiff') or Yang on the out breathe.
EXTERNAL: The 'Opening Wide' exercise that follows is formulated to encourage Chi (or, well oxygenated breathe) to our extremities or the external and therefore in this instance the hands must begin as 'soft' or Yin (when close to the chest) and then become 'hard' or Yang with the in breath.

Upon completion of the the same number "Embracing the Tree - High and Low" (say five of each as above) return your hands and arms to the Embracing the Tree - High start position and now 'soften' your hands completely.
Breathe in as you begin to open your arms wide, as if doing a slow 'star-jump' on the spot. As you open your arms, raise up at the knees and 'expand'. On this occasion, because this is now an exercise for external development, you may 'stretch' your fingers when at full expanse.
As you breathe out, allow your arms to return slowly 'inwards' towards your chest and as you do so sink again at the knees. Repeat at least five times.

Note that this larger movement of the arms takes longer to execute - and therefore to coordinate breathe and movement correctly you will need to 'hold full' and 'hold empty' for longer on the in and out breaths - as described in Session 2 - Module 1.

In the next Session I describe how this set of exercises may be extended so as to add the classic "Connecting Heaven and Earth" set, but for now I shall describe how "Embracing the Tree - High and Low" may be concluded at this point.

THE DO TAI CHI SYLLABUS - Segment One (Sessions 1 - 5) Tai Chi Foundation Course. Chi Kung exercises to encourage the development and accumulation of Chi. Also functions as a six week 'stand alone' course in Chi Kung style meditative standing and breathing exercise sets culminating in the classic "Embracing the Tree" and "Connecting Heaven and Earth" Chi Kung sets.

In all session lesson plan notes it is recomended that each exercise be repeated "at least five times". This is an ammount that is suitable for begginners. Later, when comfortable, all exercises may be repeated up to thirty times each. If you decide to increase any one particular exercise to say ten repitition, increase ALL individual exercises to the same number.