Learn Spanish (Latin America): Durante el combate, uno mantiene la postura.

Both work for general statements, but uno (one) feels a bit more personal. When a speaker uses uno, they are usually including themselves in the group of people experiencing the action. It is like saying 'you' in English when you mean people in general, including yourself.

Can a female speaker say una mantiene instead of uno mantiene?

Yes! While uno is often used as a neutral default by everyone, a woman talking about her own perspective or a shared experience can choose to say una. The verb still stays in the third-person singular (mantiene).

Why is the article la included before postura if it translates to just 'posture'?

In Spanish, when you talk about a concept, an abstract idea, or a noun in a general sense, you almost always need the definite article (el, la, los, las). English drops it, but Spanish requires la postura.

Does the verb mantener conjugate exactly like tener?