PREVIEW

... econd is external factors.

 Internal factors are physical strength, understanding of space rules, etc.

 Normally speaking, the deeper the understanding of space rules, the more core space models are understood, and the larger the world inside the body becomes.

 As for physical strength? It is difficult to achieve a significant increase in physical strength in a short period of time.

 But it is not difficult to slowly increase the physical strength over a long period o ...

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