Tani otoshi (Valley Drop) is one of the traditional forty throws of Judo as originally developed by its founder Professor Jigoro Kano.  The technique is categorised as a sacrifice throw (sutemi waza). It is commonly practised in Judo Clubs.

Variations of Tani otoshi are practised in Aikido dojos that include sutemi waza (sacrifice throws) as part of their broader syllabus.  Sacrifice throws are practised at our dojo as part of our studies in Aiki applications.

Overview of Judo technique 

In the below video, an overview Tani otoshi is given from a Judo perspective.

 

More Detailed analysis

The below video provides a more detailed analysis of the fundamentals underpinning Tani otoshi.