"Acceptable losses" can mean so many different things in different situations. To a military commander it can mean the number of casualties in a battle. To a college student it can mean the number of hours of sleep lost while cramming for an important exam. To me, it means doing whatever it takes to learn a new skill or pass a belt testing in TKD.
I'll never forget how important it is do do a hammerfist properly when trying to break a board because of a bruised wrist received by doing it wrong. Or how important it is to hold even a foam sword properly because of straining the same wrist while trying to block my opponent's strike. I can be pretty sure that I won't make the same mistake. At least not in the same way...lol.
My husband and I have a goal of eventually opening our own TaeKwonDo school. To get there, there will be a lot of time spent in training, sore muscles and joints, and more than likely some bruises along the way. Those are what I call acceptable losses, because its all worth it when I see the kids in class doing so well at testings and tournaments, and learning skills that will help them in life.
hmmmm.. but you really havent "lost" anything but have gained from the experience. remember, this is all a part of the journey that the GMs and SMs have been referring to. when I was a 1st degree, I sorta thought it was a little crazy talk but now, I am really starting to get it. of course, I must just learn pretty slowly but I understand it more and refer to it on the deck when teaching. Having had to recover from surgery, decide to delay one national testing a year or so afterwards because I just didnt feel ready......
It really is not a loss in my opinion but a gain. you now have experience to pass along to the students you want to have in your future school and the students in your current training school. If you have something to offer someone else, you have added to your worth and potentially to someone elses worth.