A gymnast theorist who is known for Noguchi gymnastics says that this can be easily understood if you lay on the floor and have someone hold your ankles and shake you. The motion of an object is largely different depending on whether it is solid or liquid. Boiled eggs rotate better than raw eggs. In order to use your body efficiently, it is important to always "feel the liquid wrapped in the skin". From "A human being as a primordial life."
"May 3 2019
from “Oriori no Kotoba” by Kiyokazu Washida, The Asahi Shimbun"