Being involved in the sport of judo takes a lot of guts.  To obtain technical proficiency, physical strength and stamina, as well as intelligent strategy requires a long term, sustained effort.  It is a sport that requires sacrifice, focus, and just plain guts.  To remain in "judo shape" over long periods of time is a truly difficult and challenging thing.  The master instructor of the judo school at which I practice in Busan, South Korea is a real-life example of this sacrifice and dedication.

One day I had brought my camera to class and before anyone showed up (other than the head instructor seen in parts of the video below) I asked if he would demonstrate some of the strength building exercises for judo.  He obliged.  He walked onto the mat cold and did some things I simply can't imagine being able to do.  In addition to this, he is 64 years old!!  Unbelievable.

A true judo master.