like silence breaking sound

It also includes these fascinating paragraphs about the role of estrogen in different types of physical activity, directly debunking the widespread notion that estrogen is the weak human's hormone and only does weak human things:

Given the fitness world's persistent touting of the hormone testosterone for athletic success, you'd be forgiven for not knowing that estrogen, which females typically produce more of than males, plays an incredibly important role in athletic performance… The estrogen receptor—the protein that estrogen binds to in order to do its work—is deeply ancient. Joseph Thornton of the University of Chicago and his colleagues have estimated that it is around 1.2 billion to 600 million years old—roughly twice as old as the testosterone receptor. In addition to helping regulate the reproductive system, estrogen influences fine-motor control and memory, enhances the growth and development of neurons, and helps to prevent hardening of the arteries. Important for the purposes of this discussion, estrogen also improves fat metabolism. During exercise, estrogen seems to encourage the body to use stored fat for energy before stored carbohydrates. Fat contains more calories per gram than carbohydrates do, so it burns more slowly, which can delay fatigue during endurance activity. Not only does estrogen encourage fat burning, but it also promotes greater fat storage within muscles… which makes that fat's energy more readily available. Adiponectin, another hormone that is typically present in higher amounts in females than in males, further enhances fat metabolism while sparing carbohydrates for future use, and it protects muscle from breakdown. Anne Friedlander of Stanford University and her colleagues found that females use as much as 70 percent more fat for energy during exercise than males. Estrogen's ability to increase fat metabolism and regulate the body's response to the hormone insulin can help prevent muscle breakdown during intense exercise. Furthermore, estrogen appears to have a stabilizing effect on cell membranes that might otherwise rupture from acute stress brought on by heat and exercise. Ruptured cells release enzymes called creatine kinases, which can damage tissues… Linda Lamont of the University of Rhode Island and her colleagues, as well as Michael Riddell of York University in Canada and his colleagues, found that females experienced less muscle breakdown than males after the same bouts of exercise. Tellingly, in a separate study, Mazen J. Hamadeh of York University and his colleagues found that males supplemented with estrogen suffered less muscle breakdown during cycling than those who didn't receive estrogen supplements.

You know that thing where a story is written in tight third person limited — we’re meant to be inside someone’s head, seeing the world through their thoughts — and then suddenly the narration says “the blond frowned” or “the shorter woman sighed” about a person the POV character knows really well?

That’s called antonomasia — using a descriptive label instead of a name. And it’s fine when we’re talking about strangers: “the cashier handed her the receipt,” “the tall guy blocked the door.” The POV character doesn’t know their names, and we just need a quick way to tell people apart.

But the moment it’s used for someone the POV character already knows, it breaks immersion. Because that’s not how our minds work. We don’t think “the older man smiled at me.” We think “Mark smiled.” Or maybe “my boss” if that relationship matters in the moment.

Third person limited means the narration sits inside someone’s perception. Their inner monologue is the story’s voice. So when you switch from “Mark smiled” to “the blond smiled,” you’ve pulled the camera away from their mind and turned it into an outside shot.

If you want to create distance or irritation, you can do it on purpose —

“The idiot from accounting emailed again.”

That’s character voice. That’s judgment. That works.

But otherwise?

As soon as your POV character knows someone’s name, use it. While we do tend to worry about repetitions, names rarely register as such to the readers.

If you need variety for rhythm, use relational or emotional identifiers that make sense in their head: her friend, his partner, their teacher, the person they loved.

Because inside someone’s thoughts, there are no “blonds” or “brunettes.”