This is difficult to explain.
Yes, there is an acupunture point called Yong Quan Xue in the middle of the foot.
Ren and Du Mai are in the mid line of the body. One is at the front and the other is in the back.
They meet at Hui Yin and Bai Hui at the bottom of groins and on the top of the head.
If you stand straight or slightly arched as the nature alignment of the spine, and you are totally relaxed.
The Qi flow thus moves smoothly without obstruction.
This is the purpose of standing practice.
Raising both arms at the level of the shoulder. The palms facing you with 10 cm apart in front of you.
This is called Tai Ji Zhuang.
The shoulders have to relax. The elbows sink a little.
This is the basic posture for Tai Ji Quan.
In the beginning, you clear your mind and totally relax all your muscles.
The neck is relaxed as if suspended. The chest tugs in a little. The back arched a little. As if you are holding a ball with your upper body structure.
They are ready to expand a little.
You focus on your Dan Tian. And just feel the wind.
If you focus on your hands, you may tense your arms.
Feel the Qi flows.
The “tension” or Peng Jin you want to feel is actually from the whole body or upper body plus arms.
The whole and not a point in hands.
And yes, some people would imagine a point between the hands and focus on that. But that would tense your muscles for a lot of people.