Co-ordinate the movements of the upper and lower halves of the body.
If the lower half of the body moves this is pushed up through the upper half of the body so the body moves smoothly and effectively as one, so one side strengthens the other connecting with the energy system keeping it moving unimpaired so nothing is ever still so does not become stagnant. Creating movement where there is stillness and stillness where there is movement creating Yin and Yang in the body. Dual Monism.
Tai Chi Walking emptying and filling in coordination using the whole body.
Try this little exercise for coordinating the body.
Raise one leg and both forearm’s and hands so the thigh, forearms and hands are parallel to the ground toes pulled back, all on the IN breath.
On the change from the In breath to the out breath, relax the toes down and change the hands so the palms face down.
Then lower the leg and both forearm’s and hands so they all arrive on the ground together with the foot one pace in front of the other foot, this is all on the OUT breath.
Repeat on the other side and continue with this for approx. 10 IN and OUT breaths then practice placing the foot one pace behind you so you now walk backwards.