I like to think Chun-Li's thick thighs are mostly genetic, rather than the results of strenuous exercise. I like to imagine she got picked on a lot for her physique growing up (as most chinese people are too low test to appreciate a robust lower half). I imagine her being incredibly insecure about her body her entire life, until she meets me, and receives the validation and reassurance of her beauty and self worth that she's always been looking for. I'd reassure her that her thighs are actually quite beautiful, and that she should perhaps pursue the world of Street Fighting as a means of self expression. I'd also back my words up with actions by repeatedly engaging in various sexual shenanigans focusing largely on her thighs. Whenever Chun sees a dollop of semen on her pantyhose, she's reminded of my unyielding love for her, and her heart begins to flutter as it did when we first met.