preserving knees and shoulders....
now that I'm getting back on the mat after an injury....and having heard many aikido stories of knees and shoulders incurring wrath from the mat...I would love to hear some ideas about taking care of them.
So far I have: listen to your teacher re proper technique. Perfect the roll. Don't train overly hard when very tired. Listen to myself. Go easy on the seiza when the knees start yelling.
Any others you've gleaned from your own or others' experiences?