Summary
The ability to traverse walls, ceilings, water, and similar surfaces without the risk of falling from gravity. This could involve a variety of methods ranging from creating attraction between a part of one’s body and the surface to making use of spiked footwork. The user needs to have a free range of motion across the surface without significantly altering it, or relying on features present that wouldn't be found on smooth surfaces.
Moving along surfaces through sheer momentum or by damaging the walls should not be classified as this ability as they are both simply common consequences of Superhuman Speed and strength respectively rather than being distinct powers on their own.