Takeda Sokaku was an acrobate? I was not aware of this. I don't think I have read this before. What do you mean by hand balancing? Like balancing an object in your hand?
Could you name a book or other publication (Aikido Journal?) that mentions this or tells more about it?
Sorry. I was just kidding around a bit. Don't take me seriously. Hand balancing is learning to do handstands...it's supposed to be good for the core...if it's any good in developing IP/Aiki, I don't know.
PS Thanks Chris...