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The middle girl is the brawler. Her breasts say so.

When you have a larger group of females who may be involved in some action (...err, as in, fighting), the one with the biggest breasts will be the strongest one. You'd think that those giant knockers would impede her in some way... another one of the big advantages of the Most Common Superpower?

The simplest explanation is that the woman is simply bigger than the other female characters, or simply older and thus more fully grown and developed, or both at once. In any case, her greater general size leads to both larger breasts as well as greater muscle-mass and leverage.

If all of the female characters are physically active and she is the oldest, it can also be assumed she's been actively building strength and learning how to use it longer than her juniors have.

Sexually, this could be boiled down to a function of fanservice: a Law of Skin-To-Strength Ratio. Take the classic barbarian of either sex — they wear little and bare a lot of skin, but are incredibly reliant upon brute strength. The more flesh they have to bare, the more strength they bring to bear. While this trope doesn't rely on explicitly bared skin, the female's attire will seldom hide her impressive shape, and instead tend to emphasize it. (Or, in the more extreme cases, perhaps they merely need to be that strong in order to stand up straight.)

Visually, it's a fairly simple design point: the artist wants to indicate and reinforce the notion of physical strength. A large-breasted female tends to look larger overall, and more solidly built. The other route for showing obvious physical strength would be giving the woman a massive bodybuilder physique. As the former is more commonly appealing, and the latter is more commonly intimidating, you can see the obvious choice.

Of course, neither route is particularly realistic. The goal and result of bodybuilding is to achieve the largest possible muscles — while this does grant more strength, it is not the same as achieving the most possible muscle strength; in fact, it hinders that. The strongest men and women are commonly quite wiry.

However, women athletes also tend to be quite modest in cup-size as well, due to the other reality - milk-producing mammary glands are a very small percentage of the breast; most of it is actually composed of fat tissue. This is also why you rarely see Olympic athletes with anything above a B-cup. This may also be because it is hard to adjust for a large set of breasts, actually forcing one prodigy gymnast to drop the sport when she developed.

But there are two counter-realities that can keep this trope aloft, logically speaking. Working out can make breasts perkier, because it tightens the muscle they're against. And if a woman is less concerned with her total weight than with her actual health and personal appearance, maintaining a reasonable layer of healthy fat can help her retain soft, flattering curves over her hard, strong muscles — the best of both worlds. Olympic athletes probably neglect to do so because the additional, unnecessary weight would negatively affect their performances.

However, one must note that a good pair generally comes with more weight, usually not of the breasts only, either. And, admittedly, unlike sports, where weight slows one down, a heavy yet sufficiently mobile frame is an advantage in a fight. There's a reason for weight categories in most combat sports: even among boxing superstars, next to none of the lighter weights have a one-hit KO punch, and are instead highly agile and technical fighters (notable exceptions like Kostya Tszyu, who is both, notwithstanding). A manageable amount of extra weight simply boosts power.

It should be noted that the Greco-Roman ideal of beauty and health for men and women not only involved physical fitness, but also included such a layer of fat. The person's curves denoted vitality and wealth, as poorer individuals could not afford to eat so well and thus suffered from a lack of strength and energy.

A physically strong female without Boobs Of Steel is most likely a Cute Bruiser.

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