تفاوت در بیان تناسب اندام آقا و خانم

خیر. برای تناسب اندام متفاوت نیست.

به خانم یا مردی که بدن سالم و قوی ای داره (خصوصاً به دلیل اینکه ورزش می کنه) میگن fit هست.

I jog to keep fit.

به کسی (خانم یا آقا) که چاق نیست و بدون خستگی قادر به ورزش کردنه میگن in shape هست.

I hope to get in shape for summer swimsuit season.

در مورد کسی که بدن عضله ای داره هم از muscular, fit, in good shape, strong و ripped استفاده میشه که برای هر دو جنس به کار میره.

 البته کلماتی هستند مخصوص مردها و خانم ها که به فرم خاصی از بدنشون اشاره داره:

• barrel-chested: a man who is barrel-chested has a round chest that sticks out
• burly: describes a man who is large and strong
• husky: A husky man or boy is big and strong. 
• leggy: A leggy woman or girl has long legs
• hourglass figure: a woman who has an hourglass figure has a narrow waist in comparison with her chest and  hips

در مورد بیان زیبایی اما تفاوت وجود داره.  برای خانمی که زیبا هست از صفات زیر استفاده میشه:

beautiful, pretty

برای مرد زیبا از:

handsome

برای هردو:

good-looking, attractive, cute, gorgeous, nice-looking, lovely

"In good shape" is kind of relative to the age of the person you are talking about. When you say 'My girlfriend is in good shape" it usually means physically fit, but if you said "my grandmother is in good shape" it's more that she is healthy for her age.

Other example:"Which patient do you want in the O.R. first?" Answer: "The one on the left; the one on the right is in good shape" (meaning, "isn't facing any life-threatening injuries"). The phrase is quite flexible and context dependent.

Fit means :in good health, especially because of regular physical exercise.
"my family keep fit by walking and cycling"

"People who are physically fit are happier, healthier and more productive than those who are not."

also we have :"(as) fit as a fiddle" which means: In very good health

buttom line, when we use the word "fit"  the consept of exercising is basically implied

You can describe an athletic body as muscular, fit, strong,  in good shape, or “ripped” – that’s a slang word meaning that the person has very well-defined and visible muscles

good luck