"superbly fitted" is correct and usable in written English.
You can use it to describe something that is perfectly adapted to fit a certain purpose. For example: "The suit I got tailored was superbly fitted and made me look very stylish."
But that advice can gall those of us who once were faster, once were slimmer, once were superbly fit.
During morning rush, the teeth-gritting of drivers is almost audible, as superbly fit cyclists, wearing Sharpie-toned spandex and riding $3,000 bikes, cockily dart through the swampy, stolid traffic to offices with bike racks and showers.
Melzer is a superbly fit left-hander from Austria who has been ranked in the top ten.
Superbly fit and a relentless competitor, he seems intent on outworking and outperforming those half his age.
LONDON — Perhaps before we ask whether we are witnessing the end of Barcelona's magnificent era, and the rise in its place of a powerful Bayern Munich, we should get one thing straight: It was lunacy for Barça to expect to take on a superbly fit and supremely confident German champion in its own backyard with ten and a half fit players.
Two weeks later, a panel of thirteen admirals recommended that Moosally be given another major command, stating that Moosally was "superbly fit" for such responsibility.
Two weeks later, a panel of 13 Navy admirals recommended that Moosally be given another major command, stating that Moosally was "superbly fit" for such responsibility.
Nash was a superbly fit athlete who never smoked, drank rarely, and dedicated himself to a punishing exercise regime; something rare in 1930s sports circles.
These qualities fitted him superbly for the role of Hamlet, of which he proved himself, in his four productions of the play, to be the supreme exponent.
