When you're tumbling along the fast track you have to keep straight, you have to keep in line as well. You don't want to fall over sideways. A somersault naturally propels an acrobat forward. Forcing the body to turn in one place requires flexibility and strength. It's never been difficult for me.
Smaller circles rotate faster than larger circles.
To slow down or speed up, the acrobats have to change the size of their bodies as they rotate. What often goes unnoticed is the sheer strength needed to perform these acrobatic feats. They are contortionists. Nomin has been training since she was 8, Ulzee since she was 5. According to most sports experts, only certain people are born with this type of elasticity in the ligaments.