Humans aren't as good as we should be in our capacity to empathize with feelings and thoughts of others, be they humans or other animals on Earth. So maybe part of our formal education should be training in empathy. Imagine how different the world would be if, in fact, that were 'reading, writing, arithmetic, empathy.'
A fighter, a real strong fighter, should always look dignified and calm, and I believe that any expression of aggression is an expression of weakness. A strong person will not be nervous and will not express aggression towards his opponent. He will be confident in his abilities and his training; then he will face the fight calm and balanced.
Everyone has the ability to increase resilience to stress. It requires hard work and dedication, but over time, you can equip yourself to handle whatever life throws your way without adverse effects to your health. Training your brain to manage stress won't just affect the quality of your life, but perhaps even the length of it.