“Energy” refers to the vast range of what a person can actually feel–not think, but feel as wordless sensations–everything from feeling a headache or an itch or feeling sexually turned on to feeling chills down the spine or feeling waves of energy or feeling the presence of a familiar person when they are not physically present.
“Wordless” is the operative term here. It’s when we have to search for unfamiliar ways to describe what is happening inside us. For many men it is difficult to actually notice what is happening short of orgasmic pleasure or excruciating pain.
Life is literally the movement of energy. The degree to which a person is sensitive to it, is the degree to which they are alive.