Sometimes, in my opinion, "suck it up, and deal with it" can mean to stand up for yourself, and make a decision in your own best interest. In real life self defense, you have to be the one to decide when it is right or wrong to fight; when it is safe or not to proceed. In the business world, you have to know when to shut up and do your job, and when to speak up and voice your opinion. In the military, soldiers have to know how to follow orders, but they also have to have the courage, and integrity to stand up against orders that are immoral.
If someone in charge tells you to do something, and you have good reason why you shouldn't follow through, speak up and let them know. Give them a chance to take into account what you know, so they can modify their directives. In the Martial Art, if the instructor still insists you perform to full capacity, they might be making a mistake (they are human too), or they might be testing you to see if you are faking it, or to see if you will have the courage to respectfully stand up for yourself and make a sound decision. "Sir, if you want me to test, I will do the best I can with the tools I have available, but I will have to respectfully insist that I avoid any techniques that could further damage my injury."
Dealing with an ongoing health issue is one thing. Ignoring slight discomfort from minor injuries, being tired, or even feeling sick can be good training provided it does not risk more serious injuries. In real life, you might have a serious injury and still have to perform to survive, so that kind of mentality can be useful, and you never know if you will be able to push through the pain if you never have had to do it. However, a smart fighter knows how to use their strengths, and avoid their own weaknesses.
I agree with the others here. Don't try to push through a serious injury and make it worse! There will be other days, and other tests. In the future, ask your instructor if it is ok to test with modified conditions to protect your injury, or if you are not ready for peak performance, then test later. Don't let anyone tell you to do something that you know is not right for your body. You are the one in charge of your own health, and you are the only one who has to live with whatever damage you do to that body for the rest of your life. Suck it up - - deal with it - - and take charge of your own life! :mst:
Respectfully,
CM D.J. Eisenhart