Apple hasn't officially announced a smartwatch or any other type of wearable gadget, but one of its recent job listings provides more circumstantial evidence that a health- and fitness-focused wearable is on deck. On Thursday, 9to5Mac published a screenshot of a new Apple job listing for a "User Studies Exercise Physiologist"--a curious position for a company with no clear vested interest in the fit-tech space.

The job listing discovery comes hot on the heels of another 9to5Mac story that reported iOS 8 will include an app code-named Healthbook that features deep hooks into body-monitoring sensors in the rumored iWatch. Among other qualifications, the job listing explains Apple is looking for someone with a "good understanding of physiological monitoring equipment, measurement techniques and interpretation of results," and "experience with indirect calorimetry to measure energy expenditure for a range of activities and environments."

Of course, a company of Apple's size and market cap can afford to hire a veritable army of specialists just to work on far-fetched R&D. But there was another very telling line in Apple's job listing (which was taken down after 9to5Mac published its story): The individual Apple eventually hires will need to "apply relevant knowledge to the design of products and their testing/validation through user studies."

The operative word here is "products." It certainly would seem that Apple has actual exercise-related hardware in its roadmap. Now, obviously, a job listing--even a job listing that someone found so provocative that it needed to be removed--is still just a job listing. But the evidence is mounting that some kind of fit-tech wearable is coming. 

Below is the full screen grab of Apple's job listing, captured by 9to5Mac. And before I completely plummet down the rabbit hole of cynicism, I'll concede another possible reason why the listing was removed: It's always possible Apple found a person for the gig.

The iWatch rendering at the top of this article was created by Todd Hamilton. You can see more of his iWatch concepts here.