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Microsoft will bring a subscription-based Xbox Fitness Pass to Xbox One that lets console owners workout with famous trainers, according to a page that has since been pulled from Xbox.com.

Xbox Fitness will use Microsoft's next-generation Kinect sensor to detect muscle movement and micro-fluctuations in the skin to read a user's heart rate, according to the site. Personal trainers featured in the Xbox One workout program include Tracy Anderson, Jillian Michaels, Tony Horton (co-developer of the P90X program) and Shaun T (creator of the Insanity program). Xbox Fitness promises "the world's best workouts with instant, personalized feedback."

Xbox One's fitness program will be subscription-based, but Xbox Live Gold subscribers will get unlimited access to Xbox Fitness through Nov. 2014, at which time a paid Xbox Fitness Pass subscription is required, according to the site.

Xbox Fitness has not been officially announced by Microsoft. Polygon has reached out to the company for confirmation of its plans.

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When you have a static (non-moving) light in a game, you have two options for rendering this light. You could render it the same as a dynamic light; that is, feed it through the shader pipeline which will calculate its effect on everything around it, every frame, on its way to the screen. This is obviously pretty expensive. Or, an editor can bake the light into the scene.

What I've always thought of baking was perhaps a more simple version: basically the editor just takes the textures of everything around the light, calculates the effect of the light on those textures (brightens them, perhaps colors them, shadows, etc.), and saves them as replacement textures to use. So all the textures around the "light" look like they have a light cast on them, but at runtime there actually isn't a light from a calculation standpoint; it's an optical illusion, essentially.

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Microsoft is building its own cloud gaming service. Company officials demonstrated a prototype of the service during an internal company meeting today. Sources familiar with the meeting revealed to The Verge that Microsoft demonstrated Halo 4 running on a Windows Phone and PC, both streaming the game from the cloud. We're told that the concept service runs smoothly on both devices, and that Microsoft has managed to reduce the latency on a Lumia 520 to just 45ms.

We understand that Microsoft is building the service as a way to stream games to its Windows devices. Microsoft's demonstration included a Windows Phone with a Xbox controller attached through an accessory, and a low-end hybrid PC. Microsoft has not yet branded the cloud games service, and officials stressed it was simply prototype at this stage. It appears to be an answer to Sony's acquisition of Gaikai's streaming technology that the company plans to use for PS3 and PS4 game streaming sometime in 2014.

"Hints at cloud backwards compatibility for Xbox One"

Microsoft has been gradually building a cloud service for Xbox One games, but the company also hinted that it may be able to stream older games to provide backwards compatibility. Microsoft's senior director of Xbox, Albert Penello, said "it could be more complicated things like rendering full games like a Gaikai and delivering it to the box," in a recent interview with Gamespot. "We just have to figure out how, over time, how much does that cost to deliver, how good is the experience."

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Maybe you could just be happy about that without acting like a douche?

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Today we announced Xbox Fitness is coming to Xbox One. The extensive library of videos from the world’s biggest fitness brands including Beachbody’s P90X (Tony Horton) and INSANITY (Shaun T), Jillian Michaels, Tracy Anderson and others, will be available for free with Xbox Live Gold memberships through December 2014. Using Kinect technology, Xbox Fitness can read your heart rate without a monitor, see which muscles are most engaged by measuring the power, force and transfer of weight in your body, and track the quality of your performance by measuring your balance, tempo and form.

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