Hirenkyaku

is an advanced Quincy movement technique, allowing the user to move at high speed by riding on the flow of Reishi created below their feet. Essentially, it is the Quincy equivalent to the Shinigami's Shunpo and the Arrancar's Sonído.

Description
To perform this technique, the user gathers Reishi under their feet and rides them to the desired location. Uryū Ishida implied its speed is superior to Shunpo or Sonído, though Mayuri Kurotsuchi's superior speed during their confrontation suggests this is just a generalization. Like the air-walking skill displayed by most Arrancar and Shinigami, it can be used to hover or fly over long distances. Mayuri complimented Uryū on being able to use this technique at such a young age, suggesting it is difficult to master.

Hirenkyaku enables Quincy to keep up with and overpower faster opponents depending on the user's skill. The use of this technique aided Uryū as he defeated a seated Shinigami officer, a Números Arrancar, and even a Privaron Espada in combat. However, there is apparently more use for the technique than simply moving quickly.

Trivia

 * Mayuri Kurotsuchi theorizes that this technique is only called Hirenkyaku by the Ishida Family and the Wandenreich has another name for it.