I heard that he was pleased with the "goldfish" exercise, kingyo undo.
In our warm up routine we do this one, and hifuku undo. I don't know if this part goes back to O Sensei, but my teacher studied in Hombu Dojo from 1955 to 1965.
Thanks Markus, is there any video on hifuku undo? I only found this picture on the Aikido Sangenkai blog: https://www.aikidosangenkai.org/blog...ifuku-undo.png
They remind me of Masatomi Ikeda's Genkikai: https://www.facebook.com/filippin.re...5409485509988/
I know Ikeda Sensei officially added some exercises from the Nishi system but I don't know which exactly.