Of course it does. There are SO many variables. A size 2 woman with normal or under body fat will be able to bend, move, and exercise differently than a woman with 30-40% body fat who may not be as fit or who's body proportions may prevent certain movements. As a fat granny I know this! But that does not mean fat equals unfit. I was always overweight as a kid but I could ride a horse like a wild woman, run track like Forrest Gump, and get boyfriends as easily as any skinny mini. Plus I was rockin the most awesome Farrah Fawcett haircut! Lol
I still try to stay active despite serious injuries and health problems today in my 50's. And as for shoes and fashions, there is not a day I go into town that at let several strangers don't compliment me on my shoes and/or outfit. Fat also does not need to mean unfashionable, especially with today's clothing lines!
Yes, the ablity to execute an exercise can depend on level of stamina, willingness to really engage in exercise and overall general health and condition of the body.