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Training for personal Defense is not all serious kill-or-be-killed stuff, nor should it be.
What's the point of defending a life of misery?  Sometimes training gets intense.  As you become more and more skilled, you want to challenge yourself.  It's only natural.  Just remember to have fun along the way!  

Check out the video I found of the people at Exuberant Animal.  These guys are having a good time while getting fit.  Let me know what you think!