After Athan went to check on Tiana, Avelia, and others, he guessed that they might break through to the 2nd order of Zen order elite in the next three to five months by creating their first mini chaotic world.
On the other hand, Athan decided to break through to 2nd stage of the Atmospheric body realm since he had already mastered Condensation of Tiny chaotic power.
The training of the body was simpler but painful from Zen realm order.
To increase the strength of the body, one had to grasp Body zen order sets and...infuse them into their own body. This process is painful, but it is the only way to advance further in the Atmospheric body realm.
Since this process is painful, not many people continue strengthening their bodies and just focus on Essence and Soul to advance in the way of chaos and order.