But never tried USTA yet, don't want to make an easy game too serious for me at this age like Lao Dao, playing tennis for fun and for sweating is what i am after.
I have a friend here just like you, he knows all the thoeries about tennis, and like coaching others alot, when its time to apply his thoeries to his playing, he can't make it..but whenever i have some technique questions, it'd be him that I'd consult with.
Currently, my problems are my right wrist and my knees.
I have used them too much, and maybe its time for me to have a break of a few weeks before coming back to the courts again, but...sigh..you know what I mean..hehe.