Men/Women: Who is under more pressure to stay fit?

For both men and women who are actively dating, a certain level of fitness, and staying at it, is often expected from their potential partners.

For heterosexual people, which gender is generally under more pressure to stay physically fit in order to be viable in the dating world? Please tell us how you perceive the situation in your country/culture.

N.B.

1) I am NOT asking about what kind of pressure you are under personally. Just talk about men and women in general.

2) I am NOT talking about facial features or surgeries, either. This question is strictly about maintaining a desirable figure.

3) I am NOT talking about married/committed couples.
Men/Women: Who is under more pressure to stay fit?
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