It struck me that this analogy applies to many instances in our lives too. If you take up a challenge that’s too hard and if you do not succeed as a result of that, there is a negative reinforcement. The opposite happens when you take up a challenge and succeed. Along with the success you get a positive reinforcement for future endeavors. So its almost like if you succeed you get 10(success)+10(positive reinforcement/motivation)=20 points. But if you fail, you lose 20(failure+negative reinforcement/de-motivation) points from your current position.
In Martial arts, while breaking blocks, for most efficiency the rule is that you need to break the block/blocks in the first go. This way your deceleration is not as abrupt as when you fail to break it. If you fail to break it, by newtons third law, you would get a reverse reaction force and this can injure you. Many of the professional block breaking martial artists need to make sure this backfiring force does not kick in by ensuring that the blocks are going to break in the first go. They do this by conditioning their body part to progressively break more and more such blocks. Each time, they take a load that’s just sufficient for them to break through.