I and my partner were practicing take-downs. During one of such take-downs, I landed with my ribs onto his knee (which he probably moved forward instinctively). The subsequent sharp pain every now and then tells me that I need to learn to fall more safely. But how? I am not asking about the basic rolling technique, but specifically about protecting the ribs from taking a hit like that. Simply being relaxed does not seem to help in this situation... The hands aren't there either during the fall (they actually have another job -- to protect the head).