“The Section on the assimilation
of what thinks it perceives,
with the source of perception.”
– Paul Harvey introduction to Yoga Sūtra Chapter One

“With regard to Dvi Pāda Pīṭham, a key Bhāvana is on the feet.
A common approach is people not working from their feet.
Instead they are primarily using their buttocks to push up.
Desikachar taught that we both lift and lower from the feet
Thus Two Foot Support is controlled by using both feet.”

“With regard to Dvi Pāda Pīṭham, a key Bhāvana is on how we use the arms.
In the beginning try exploring leaving out raising the arms as you come up,
as shoulder movement means that people can start to move about on the mat.
Here we need to focus on lifting the body upwards as many people slide backwards.
Also many people will push up too much from the buttocks and distend the belly,
which in turn will increase the abdominal pressure and disturb the Apāna Sthāna.
So initially when learning this posture the Bhāvana of lifting from the feet is enough.
Then adding the engagement of a Bhāvana on the arms, by making the arms active.
Thus whilst lifting engage pushing the full length of the arms down firmly on the floor.
Once the legs are active and the arms are active, the neck can lengthen more naturally.”