Alter Aeon Online Help

Keywords are:  'skill jumping'

Usage:
jump

You can jump in place. This uses a little bit of movement. You cannot
jump if you are flying, unbalanced, not on solid ground, entangled and
so forth.

Jumping doesn't do much on its own, and it prevents you from performing
various activities, at least during the brief time you are in the air.
However, certain skills, such as kick or stomp, can do more damage if
performed while jumping. This is not without risk - you can become
unbalanced if you are too tired, and can fall and injure yourself.