User has both extremely well developed sense of balance, the positioning of limbs and the center of balance as well as the physical condition to use these facts. This combination makes them almost impossible to being knocked down/imbalanced, falling down and able to recover from momentary imbalances near instantly.
User is able to perfectly balance on any object, no matter how narrow or unstable it may be.
Catgirl/Kitrina Falcone and Catwoman/Selina Kyle (DC Comics)
Scott Free/Mister Miracle (DC Comics)
Daredevil (Marvel Comics)
James Logan Howlett/Wolverine (Marvel Comics) showing off perfect dodging balance while X-23 attacks him.
While evading attacks from Young Avengers, Winter Soldier (Marvel Comics) easily balances his body with him holding the very edge of the building with just using two fingers without any slip nor hesitation.