Genetics is hardware. Epigenetics is software. Loosely speaking.
Capacities, in the DNA, can be expressed, switched on or switched off, like a plugin that provides additional functionality in a software.
When you change, you do more than just surface changes: in effect you change how the DNA, capacities, etc. get switched on or switched off… you are creating epigenetic changes. And not just physical, the aspect “science” is talking about, but the whole person. Not just fat/skinny health conscious, life-unconscious aspect… but really the whole intelligent person who you are or… ahem… not.
The first phase of growth is to plug the leaks of energy, life force, glycogen, time, working memory… eliminate the mistakes, sloppiness, etc.