There are many asanas where the practitioner turns, twists and balances the body in different directions. These types of movements are performed even by acrobats, gymnasts, gipsies etc.
When anyone comes to your house or your place, you offer that person a seat. This seat is generally a chair.
Development and Improvement take place gradually. When you practise asanas, you should practise them mechanically.
At the beginning of the practice, the mind is focused on the body, its condition, development and safety. When the body reaches a level, that is a level better than the previous state, the mind stops interfering and attending to the body and begins to take care of itself.