"When biochemistry developed to the peak point, terrifying existences known as 'biochemical beasts' were invented!
"Training genes can be dangerous because the world of hereditary information is as vast as an ocean and utterly unpredictable. There is no telling what kind of changes would happen to somebody when they activate part of their dormant genes. They might grow scales all over their body, and they become as tough as iron, but they also might suddenly turn into a pool of pus and die a miserable death. It is possible that their appearance might not change at all, but their breathing organ might no longer be compatible with the air. As a result, they would suffocate even though the air is plenty.
"Therefore, we all tread lightly during our training and never dare to unlock the gene strands randomly.