Abahbounce

An abahbounce is a movement technique in Jak II and Jak 3 that can be used to gain much more height than conventional jumping techniques. It is performed by ground pounding into a wall
surface and then jumping once Jak's ground pound animation finishes. The left analog stick will need to be in a neutral position and Jak's momentum will need to be near 0 for the bounce to occur.
Tutorial
Technical
Discovery
This technique was discovered by the speedrunner Abahbob, though it is unknown when or how it was discovered.