Mine: Scrawny
I won't link to it because I got a ban last time I did anything involving naked humans but if you look for a kickstarter project called [i]Embrace - The documentary that will create global change[/i] this is what triggered it. There is a picture of a naked woman but it's not sexual or owt. I've no idea whether her campaign will make any difference but, imo, making people feel positive about having an 'ordinary' body isn't a bad thing.
I have a 12 year old daughter who's increasingly conscious of how she looks and yet my son beyond some vague desire to have a six pack is really not bothered. I don't know if women are so 'down' on their bodies because of how they are made, genetically, or how they are conditioned but it does bother me that my daughter is already so concerned.
I guess my 'one word' isn't terribly complimentary but I can honestly say I don't feel the need to look away when I see myself naked in the mirror which is probably the best decider of if you're comfortable in your skin?
so, what's your word?
Old.
Tenacious.
Scaly
Hairy!
Useful.
Adonis
Fixer-Upper.
Hairy.
Edit - beaten too it!
I'll change it to Godlike.
Magnificent 😉
****
Repugnant
Lithe
used
buxom
Buff
Ectomorphic.
Grr. Google Voice is rubbish when you've got a cold. I said "enormous".
Twerky.
Knackered
lanky
Chiseled!
Body - hot
Mind - willing 
Envied
😉
Tidy
(The Welsh tidy 🙂 )
Resilient.
reptilian
Taut
dagnabbit, I meant 'ripped'
LSOP
hot - the temperature kind.
a temple.
Abused
downsizing
Wobbly
Awsumz
Svelte
Robust.
Enervated.
indolent
Failing
Used.
Badass
Amortised.
RM.
Underrated
underperforming
Rotund
Comfortable.
OP great project well worth 5 minutes to watch the trailer. Soft and Luscious FTW.
could have lots of the above but will go with
'salright
Vile.
fubared
Metalic
Oh wait... [i]not[/i] metalic.
Muffinhairpole
Good at its job.
I'm not skinny (or fat much) but my body doesn't get injured or ill very often, and so far it's avoid any health problems beyond myopia. And I just want to let it know that I appreciate it.
Buddha.
(but with a bit more hair)
broken
Decluttering
Sweet.
Broken.
Edit: FUBARed
Shaven.
refined
Broken
Statuesque
TANK
Compact
Home.
Erect
Resiliant
Freckly
Bionic
Basic
Buffanky!
(a word i have just made up to combine Buff yet Lanky 😉
Disappointing.
The women at the start of that vid sound like they've been reading the advice I posted here about getting in shape, and had made a good start! 😉
Those most happiest with their bods can be those who are really into a sporty activity. The conditioning actually makes them look good, even while they're thinking less about how their body looks and more about what it can do.
The options are almost limitless, but maybe avoid sumo.
Almost forgot - "aspirational".
Dense
derelict
Mortal.
DrP
Tired
BOBFOC
[b]Scar[/b].
😡
p/s: I shall have my revenge and they are not allowed to get away.