Ushiro Waza, defense against attacks from behind: Ushiro ryote tori Dai Ikkyo 

Ushiro Waza
The techniques behind are one of the pillars of Aikido. Besides the simple fact of defense in these situations, they are symbolic tools of dealing with the unknown, the unpredictable, with what we can not see.
In the above video, it is the technique explored is the Ushiro Ryote tori Dai Ikkyo.
Uke: Luiz Felipe Martins 3°dan e Bruno Machado 4°dan
filmed and edited: Ricardo Silveira