Jay Blahnik Discusses Success of Apple Watch's Fitness Test Lab Over Past Five Years

Ahead of Apple's now-confirmed September 12 media event, during which it's believed to announce the newest versions of the Apple Watch, iPhone, and Apple TV, Men's Health was invited to visit Apple's secret exercise lab where activity data on its wearable device is collected. Apple invited the media to its Apple Watch lab before the launch of the original Apple Watch in early 2015, and now Jay Blahnik, Apple’s director of fitness and health technologies, said that the lab has "collected more data on activity and exercise than any other human performance study in history."

Although Apple revealed the lab in 2015, Blahnik mentioned that work in the department has been ongoing for the past five years. The lab enlists Apple employees to perform various exercises while hooked up to metabolic carts, ECG machines, and $40,000 masks that analyze calories burned, oxygen consumption, and more. Around 40 employees work out in the lab at one time, all monitored by 13 exercise physiologists and 29 nurses and medics.

apple watch lab 1


The lab includes a studio for group fitness programs, one room with an endless pool to measure the new waterproof abilities of Apple Watch, and another trio of rooms mimicking intense temperature conditions, which Apple calls "Higher, Faster, and Stronger." In 2015, Blahnik said the lab had collected over 18,000 hours of fitness data on over 10,000 workout sessions, and now those numbers have jumped to 66,000 hours and 33,000 sessions.

“Our lab has collected more data on activity and exercise than any other human performance study in history,” says Jay Blahnik, Apple’s director of fitness for health technologies, in a rare interview. “Over the past five years, we’ve logged 33,000 sessions with over 66,000 hours of data, involving more than 10,000 unique participants.” A typical clinical trial enrolls fewer than a hundred participants.

Blahnik commented on the "game-ifying" of fitness challenges that Apple has introduced with Apple Watch and Activity Sharing, where users can follow their friends' calorie, workout, and standing data throughout the day, and encourage or taunt one another in the process. He said that Apple's goal was to make it easier for people to feel part of a workout community, even when they aren't nearby one another, providing another "fun way to stay in touch" with friends on Apple Watch.

apple watch lab 2
With watchOS 4, Apple Watch devices will also be gaining the ability to provide more nuanced insight into each user's daily goals, and give them little prompts towards the end of the day regarding how close they might be to closing an Activity Ring. The company has put together corporate fitness challenges around all of these activity features in the past, which Blahnik said has catalyzed healthy lifestyles that many employees continue to maintain.

This year Apple held its own global monthlong corporate health challenge, with tens of thousands of participants in teams of four, using the Lose It! Challenges app. Closing the watches’ tricolored rings was part of the game. It seeded health streaks that many at the company are still maintaining. “You noticed it on campus and in our retail stores,” says Blahnik. “Everyone was more active and engaged in their health. There was a lot of back and forth to encourage and motivate your team members to close their rings.”

The third-generation Apple Watch -- expected to be called "Series 3" -- is rumored to include cellular connectivity, further untethering Apple Watch from iPhone and allowing users to send messages and stream Apple Music solely on the wearable device. The Apple Watch Series 3 was originally rumored to see a major design overhaul, but more recent reports have said that added LTE connectivity will be the third generation's big selling point and a form factor change will be held for a future device.

Related Roundup: Apple Watch 11
Buyer's Guide: Apple Watch (Buy Now)

Popular Stories

iOS 26

iOS 26.2 Coming Soon With These 8 New Features on Your iPhone

Thursday December 11, 2025 8:49 am PST by
Apple seeded the second iOS 26.2 Release Candidate to developers earlier this week, meaning the update will be released to the general public very soon. Apple confirmed iOS 26.2 would be released in December, but it did not provide a specific date. We expect the update to be released by early next week. iOS 26.2 includes a handful of new features and changes on the iPhone, such as a new...
Google maps feaure

Google Maps Quietly Added This Long-Overdue Feature for Drivers

Wednesday December 10, 2025 2:52 am PST by
Google Maps on iOS quietly gained a new feature recently that automatically recognizes where you've parked your vehicle and saves the location for you. Announced on LinkedIn by Rio Akasaka, Google Maps' senior product manager, the new feature auto-detects your parked location even if you don't use the parking pin function, saves it for up to 48 hours, and then automatically removes it once...
Foldable iPhone 2023 Feature 1

Apple to Make More Foldable iPhones Than Expected [Updated]

Tuesday December 9, 2025 9:59 am PST by
Apple has ordered 22 million OLED panels from Samsung Display for the first foldable iPhone, signaling a significantly larger production target than the display industry had previously anticipated, ET News reports. In the now-seemingly deleted report, ET News claimed that Samsung plans to mass-produce 11 million inward-folding OLED displays for Apple next year, as well as 11 million...
AirPods Pro Firmware Feature

Apple Releases New Firmware for AirPods Pro 2 and AirPods Pro 3

Thursday December 11, 2025 11:28 am PST by
Apple today released new firmware designed for the AirPods Pro 3 and the prior-generation AirPods Pro 2. The AirPods Pro 3 firmware is 8B30, up from 8B25, while the AirPods Pro 2 firmware is 8B28, up from 8B21. There's no word on what's include in the updated firmware, but the AirPods Pro 2 and AirPods Pro 3 are getting expanded support for Live Translation in the European Union in iOS...
iOS 26

15 New Things Your iPhone Can Do in iOS 26.2

Friday December 5, 2025 9:40 am PST by
Apple is about to release iOS 26.2, the second major point update for iPhones since iOS 26 was rolled out in September, and there are at least 15 notable changes and improvements worth checking out. We've rounded them up below. Apple is expected to roll out iOS 26.2 to compatible devices sometime between December 8 and December 16. When the update drops, you can check Apple's servers for the ...
AirTag 2 Mock Feature

Apple AirTag 2: Four New Features Found in iOS 26 Code

Thursday December 11, 2025 10:31 am PST by
The AirTag 2 will include a handful of new features that will improve tracking capabilities, according to a new report from Macworld. The site says that it was able to access an internal build of iOS 26, which includes references to multiple unreleased products. Here's what's supposedly coming: An improved pairing process, though no details were provided. AirTag pairing is already...
iOS 26

Apple Seeds Second iOS 26.2 Release Candidate to Developers and Public Beta Testers

Monday December 8, 2025 10:18 am PST by
Apple today seeded the second release candidate version of iOS 26.2 to developers and public beta testers, with the software coming one week after Apple seeded the first RC. The release candidate represents the final version iOS 26.2 that will be provided to the public if no further bugs are found. Registered developers and public beta testers can download the betas from the Settings app on...
iOS 26

iOS 26.4 and iOS 27 Features Revealed in New Leak

Friday December 12, 2025 10:56 am PST by
Macworld's Filipe Espósito today revealed a handful of features that Apple is allegedly planning for iOS 26.4, iOS 27, and even iOS 28. The report said the features are referenced within the code for a leaked internal build of iOS 26 that is not meant to be seen by the public. However, it appears that Espósito and/or his sources managed to gain access to it, providing us with a sneak peek...
iPhone 14 Pro Dynamic Island

iPhone 18 Pro Leak Adds New Evidence for Under-Display Face ID

Monday December 8, 2025 4:54 am PST by
Apple is actively testing under-screen Face ID for next year's iPhone 18 Pro models using a special "spliced micro-transparent glass" window built into the display, claims a Chinese leaker. According to "Smart Pikachu," a Weibo account that has previously shared accurate supply-chain details on Chinese Android hardware, Apple is testing the special glass as a way to let the TrueDepth...
maxresdefault

iOS 26 Code Leak Reveals Apple Smart Home Hub Details

Thursday December 11, 2025 4:02 pm PST by
Apple is working on a smart home hub that will rely heavily on the more capable version of Siri that's coming next year. We've heard quite a bit about the hub over the last two years, but a recent iOS 26 code leak provides additional insight into what we can expect and confirms rumored features. Subscribe to the MacRumors YouTube channel for more videos. Macworld claims to have access to an ...

Top Rated Comments

bjaaronrodgie Avatar
108 months ago
It's crazy that they spend so much time on this, yet they're own app is leaps and bounds behind the likes of Garmin and Strava. Also, the inability to view the info on a PC or iPad is insane.
Score: 11 Votes (Like | Disagree)
tzm41 Avatar
108 months ago
I think it was the correct decision that Apple made five years ago to build their own lab and develop their own models for fitness tracking. These models really empowered Apple Watch fitness tracking, which maybe is one of the biggest selling point of AW compared to other smart watches.
Score: 6 Votes (Like | Disagree)
profets Avatar
108 months ago
I think it was the correct decision that Apple made five years ago to build their own lab and develop their own models for fitness tracking. These models really empowered Apple Watch fitness tracking, which maybe is one of the biggest selling point of AW compared to other smart watches.
Agreed. Quite impressive to see what they've done here. I love reading about this stuff. Was really fascinated last year to see how much work they had put into swim testing the Series 2.
Score: 6 Votes (Like | Disagree)
Zxxv Avatar
108 months ago
The Apple Watch is a motivator and tracker based on the users results. Apple can't guarantee any weight loss or results based on the Apple Watch alone, it's all about the individual that puts the effort in to lose the weight and stay motivated. The Apple Watch is a tool that serves as a reminder and a fairly accurate tracker to help monitor where the user is at in terms of calories and or cardio. The individual has to set goals and standards for themselves, which the Apple Watch can help regulate statistical data for measurement.
Dude do you even exercise? I've been at this for most of my life. Im well aware of the pitfalls for "ordinary" folk. Thats my point. Apple hasn't found the magic formula yet. Thats my point. Get it ;)
Score: 2 Votes (Like | Disagree)
gugy Avatar
108 months ago
I give Apple high praise. The AW for sure helped me improve my fitness. I am an avid swimmer and after using the AW my performance has improved quite a lot.
The data and challenges definitely helps push me further.
Score: 2 Votes (Like | Disagree)
Zxxv Avatar
108 months ago
I'm not sure what this response has anything to do with your first post that I quoted you on, as you stated "So what makes apple think it'll work for the average joe."

Regardless, Apple doesn't have to find any 'magic formula'. As I already stated, The Apple Watch is a tool/motivator for the individual to better themselves. Apples job is to put out the best possible product that helps the individual to understand their calorie/cardio ratio. The individual does everything else that they need to based on their effort with physical exercise. That's my point.
You're missing the point.
Score: 1 Votes (Like | Disagree)