Followed closely by Sutrisno Shotokan, Aikido and Tjimande over 10 years.
And there were many other studies of shorter duration.
One time during my initial Isshinryu instruction, my instructor, Dennis Lockwood, was going to use me as his uke. What he was going to do was a hip throw during the demonstration. When he first practiced it with me, and he went to do it, a course on wrestling I took in college kicked in and instead of being thrown, I lowered my center below his and he was the one thrown.
He had me begin again, then with the slightest touch or tug, I went falling or flying in the direction he touched me. There were so many corrections, after 15 years of work I realized I was doing nothing right.