It is executed in a similar way to that of Tiger Uppercut, with a kick button used instead. In the early Street Fighter II series, the motion is a diagonal half-circle forward motion. Sagat jumps forward and rams into the opponent with his knee, hitting twice.
It can be used as an anti-air, combo ender, or as a far punish; in Street Fighter IV, it has armor breaking properties and its EX Special version not only has quicker recovery but also hits two times at its apex (allowing the full move to score up to three hits). However, if the opponent evades or blocks the move, Sagat will be left wide open for counterattack.