Jay Blahnik Discusses Success of Apple Watch's Fitness Test Lab Over Past Five Years - MacRumors
Skip to Content

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 12
Buyer's Guide: Apple Watch (Buy Now)
Related Forum: Apple Watch

Popular Stories

apple watch s12 ultra 4

Apple Watch Series 12, Ultra 4 Owners Report Skin Irritation

Wednesday October 7, 2026 12:02 pm PDT by
Some Apple Watch Series 12 and Ultra 4 owners have experienced unexpected skin irritation with the new models, according to reports on the MacRumors forums and Reddit. Affected users complain of a burning sensation and redness under the sensor area. The Apple Watch Series 12 and Ultra 4 measure heart rate every five seconds, and some people have wondered if that's the cause of the skin...
southern straps 3 1

MacRumors Giveaway: Win an Apple Watch Series 12 and a Nylon Band From Southern Straps

Friday October 9, 2026 10:20 am PDT by
For this week's giveaway, we've teamed up with Southern Straps to offer MacRumors readers a chance to win an Apple Watch Series 12 and a nylon band from Southern Straps to go along with it. Southern Straps is a California-based company that has been making high-quality bands for the Apple Watch since the device first launched in 2015, and the company's selection of bands offer a an...
apple watch series 6 blood oxygen monitoring 1

Apple's $634 Million Apple Watch Patent Bill Just Got Even Bigger

Tuesday October 6, 2026 6:09 am PDT by
Apple's $634 million patent loss to medical technology company Masimo has just gotten even bigger, after a federal judge ordered Apple to pay an additional $184 million in interest on what it owes (via Bloomberg Law). The ruling takes Apple's bill to around $818 million, but that doesn't include any post-judgment interest continuing to accrue until the judgment is paid. Judge James Selna ...

Top Rated Comments

119 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)
119 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)
tzm41 Avatar
119 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)
119 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
119 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)
119 months ago

Not the average - but - Joe Kovocs. Clearly an Athlete.

Still fat. Don't see your point.
[doublepost=1504342118][/doublepost]
By the looks of him I’ll bet he could bench press you and then some.
Only if I let him ;)
Score: 1 Votes (Like | Disagree)
Latest Stories
Crackgate? iPhone Duo Owners Report Screens Breaking Along the Hinge
Crackgate? iPhone Duo Owners Report Screens Breaking Along the Hinge
39 minutes ago
iPhone Duo Brings Back Long Lines at Apple Stores
iPhone Duo Brings Back Long Lines at Apple Stores
48 minutes ago
The MacRumors Show: iPhone Duo Arrives, Touchscreen MacBooks Next
The MacRumors Show: iPhone Duo Arrives, Touchscreen MacBooks Next
3 hours ago
Apple Released iOS 27.1 for iPhone Duo Only
Apple Released iOS 27.1 for iPhone Duo Only
3 hours ago
iPhone Duo: Open Two Apps Side by Side and Lock Them As an App Pair
iPhone Duo: Open Two Apps Side by Side and Lock Them As an App Pair
3 hours ago
iPhone Duo Launches With Carrier and Accessory Discounts Available
iPhone Duo Launches With Carrier and Accessory Discounts Available
4 hours ago
Apple Music Has a Hidden iPod You Can Play With
Apple Music Has a Hidden iPod You Can Play With
5 hours ago
iPhone Duo Says 'Hello' to You Personally
iPhone Duo Says 'Hello' to You Personally
5 hours ago
iPhone Duo: How to Skip the Swipe Up After Touch ID
iPhone Duo: How to Skip the Swipe Up After Touch ID
6 hours ago
Where to Buy iPhone Duo Today: Stores, Pickup, and Wait Times
Where to Buy iPhone Duo Today: Stores, Pickup, and Wait Times
7 hours ago
MacBook Neo Helps Apple Outpace Rivals as Market Declines
MacBook Neo Helps Apple Outpace Rivals as Market Declines
11 hours ago
Happy 25th Anniversary, iPod
Happy 25th Anniversary, iPod
12 hours ago
iPhone Duo Demand Reportedly Exceeds Apple's Expectations
iPhone Duo Demand Reportedly Exceeds Apple's Expectations
14 hours ago
iPhone Duo Launch Begins as First Orders Reach Customers
iPhone Duo Launch Begins as First Orders Reach Customers
21 hours ago
1Password for Agents Keeps Your Passwords Hidden From AI
1Password for Agents Keeps Your Passwords Hidden From AI
21 hours ago
iPhone Duo 24 Hours Later: Your Questions Answered
iPhone Duo 24 Hours Later: Your Questions Answered
22 hours ago
Apple's iWork Apps Get 'Intelligent Assistant' and iPhone Duo Support
Apple's iWork Apps Get 'Intelligent Assistant' and iPhone Duo Support
23 hours ago
Apple is Apparently Considering a Slightly Larger iPhone Duo
Apple is Apparently Considering a Slightly Larger iPhone Duo
23 hours ago
Giant iPhone Duo Displays Coming to Four Apple Stores
Giant iPhone Duo Displays Coming to Four Apple Stores
1 day ago
Apple Pulls Keynote, Pages and Numbers From App Store [Update: Back]
Apple Pulls Keynote, Pages and Numbers From App Store [Update: Back]
1 day ago
Apple Updates More Apps With iPhone Duo Support
Apple Updates More Apps With iPhone Duo Support
1 day ago
Apple Will Label Apps 'Made for iPhone Duo' in App Store
Apple Will Label Apps 'Made for iPhone Duo' in App Store
1 day ago
Amazon Takes $49 Off iPad With Prices Starting at $399.99
Amazon Takes $49 Off iPad With Prices Starting at $399.99
1 day ago
F1 on Apple TV Now Available in Dolby Atmos
F1 on Apple TV Now Available in Dolby Atmos
1 day ago
Apple Reveals More Than 50 Apps That Will Be Updated for iPhone Duo
Apple Reveals More Than 50 Apps That Will Be Updated for iPhone Duo
1 day ago
Apple Blocks Certificates That Could Help Attackers Fake Websites
Apple Blocks Certificates That Could Help Attackers Fake Websites
1 day ago
Giant iPhone Duo Installations Spotted at Apple Fifth Avenue
Giant iPhone Duo Installations Spotted at Apple Fifth Avenue
1 day ago
iPhone Duo 2 Prototypes Include Under-Display Face ID
iPhone Duo 2 Prototypes Include Under-Display Face ID
1 day ago
Tesla App Gains iPad and iPhone Duo Support
Tesla App Gains iPad and iPhone Duo Support
2 days ago
Apple Reportedly Boosts iPhone Duo Orders by 44%
Apple Reportedly Boosts iPhone Duo Orders by 44%
2 days ago