I remember once in college, I was on a campus bus and there was a girl standing (with her back to me) who had stringy, ratty hair, but this AMAZING body. I was watching her from behind and I--struggling with my weight at the time, but somehow always blessed with STUNNING hair--felt jealous.
I asked myself, "Would I trade my gorgeous hair for that gorgeous body?"
And I came up with YES, because I could always throw money at a problem of "bad hair" and probably come up with something I could live with, but I had always struggled with loving my body.
But then she turned around at some point and I saw her face, which was, well, let's just say, not at all attractive. Not at all.
And I said, "Girl, you'd better NEVER make a deal to trade ONE THING for ONE THING when you're feeling jealous of another's body (or anything else), because maybe you'd also have to take another THING you would never want in a trade."
Point is, exactly as the other poster in this thread has said, you can BET that gorgeous-bodied "flawless" woman would've traded for something you have. No way to know WHAT... but know that it's true. Everyone sees life through the lens they have firmly in place. And that's the one through which someone has a better something than we do. (And if everyone is seeing things that way, you can bet that includes the one you see as "flawless.")
So, count your blessings for the good stuff you've got.
Heck, maybe the goods you have are goods you couldn't GET with work, discipline, and patience (which are all things you CAN use to get a better, more fit body). How nice that what you covet is something you can actually attain! Some people aren't so lucky.
Just my take on it.
Cheers,
full of grace