The answer is not immediately obvious but I hope to change that gradually.
The answer you are seeking is physical energy.
There are also alternate descriptors such as personal energy or internal energy, but physical energy is the one I tend to use to refer to it. Most people do not know about it because references to it are scattered throughout many many sources, and one has to take in a lot of the materials and story to have a chance to realize its existence. I explain it in this topic if you are interested: Many flavors of energy in the Matoran Universe
But I will probably make a more in depth analysis on just this energy type one day with concrete references.
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