One of the thing in Krav Maga, and I suspect in all other martial art discipline, is to train under stress, and to have the persistent and enduring mindset of "staying in the fight, don't give up." How true this is to leading a Christian life, the stress in our life are meant to be for training, stay in the fight, with every ounce of strength you have. A two minute drill in Krav Maga may seem like an eternity while you are doing it, but it's only two minutes. Whether it's a period of a few months or a few years drill in life, it's only a drill for the life eternal to come, stay in the fight, with every ounce of strength you have, dont' give up. You will grow if you persevere through it. What is even better is that God will give you grace to go through it, just like your Krav Maga instructor exhorting you to "come on, stay in the fight, kick, punch, elbow, knee, or whatever that you know you are suppose to be doing at that moment."