Re: Yoshinkan and knees
I think aikido is very bad on the knees in general. Getting up off the mat all the time, seiza, suwariwaza all take their toll.
My knees bother me. when I get up from the mat I think about which leg to get up on. I get up on one leg then switch back and forth during the class.
I also think if you can roll out of a technique, you should. I think going down on the mat, stopping and then getting up is harder than getting thrown and rolling right back out of it.
Also, if we are watching sensei do a technique or explaining something, I will sit indian style rather than seiza.