Aikido with only one kidney
Are there any instructors or students who either have trained, trained with, or perhaps are a student/instructor with only one kidney. I've recently had an operation which required the removal of a kidney and am interested in learning Aikido, but am hesitant due to only having one kidney. I've thought perhaps wearing a "kidney belt" like the kind used in motorcycle racing might be a good idea to protect the remaining kidney. Also, the rolls and general well being that Aikido would bring might be beneficial to not only the kidney, but the entire body. So, any information / suggestions would be greatly appreciated.