Pathetic App
Response from developer
Nothing wrong with your Garmin. The sensors are excellent and we read them; that is the point. What we change is the number they get measured against. Garmin's zone chart is a generic training display, not calibrated for metabolic health. Its Zone 2 and the Zone 2 the longevity research is about are the same words for different things. That calibration is the AI. We take your full physiological picture, resting heart rate, measured max, VO2 max, and how hard each session actually felt to you, and compute your real, adaptive Zone 2 range. It moves as you get fitter. And the number has to be right to be worth anything. 150 minutes a week or more at a pace where you can still hold a conversation raises VO2 max, lowers resting heart rate, and improves markers like fasting insulin and hs-CRP. Aerobic fitness is among the strongest predictors of how long and how well people live. Train 10 bpm off the band and you do the work and get little of it. If yours looks wrong, I would like to see it. support@zone2ai.com reaches me. Rod, Founder of Zone2AI
Unacceptable Data Loss: Unstable Third-Party Software
That trust is misplaced. After completing a strictly controlled 36-minute workout and tagging it as 'Other' upon saving, the app suffered a critical crash. It completely failed to write the .FIT file to the watch's hard drive, permanently deleting the session.
This is not a minor software glitch; it is the outright destruction of a valuable, well-performed workout. The permanent loss of these specific cardiovascular parameters actively corrupts the physiological data required to accurately evaluate progress and structure future training patterns.
Do not pay for software that jeopardizes your data integrity. You can achieve the exact same physiological targeting securely by setting custom High/Low Heart Rate alerts directly within Garmin’s native, crash-proof activity profiles.
Response from developer
Updating this, because part of what I wrote here is no longer true. The "Other" activity type that destroyed this session is gone, and that specific failure cannot recur. But I said saving was reliable, and it was not something I could stand behind. A later session on the same watch model was lost a different way. What changed since: the watch app no longer pushes any menu over a live recording, and that component was present in every reproduction we have. Stopping and discarding now happen on the workout screen itself, with two presses required to throw a session away. I am not calling this closed. It stays open on our side until the field data says the failure has stopped, and one scenario is still untested. That is the honest state of it. Rod, Founder of Zone2AI
Overall great stuff
Response from developer
The three-weeks line is the most useful thing anyone has written about this app, and it changed how I explain it to people. Zone 2 gives you almost nothing on day one, which is exactly why most people quit before it starts working. Congratulations on the 15:49. Rod, Founder of Zone2AI
Responsive developer and solid product
Response from developer
Thank you. You've named the thing I care most about getting right: most of what's customisable in here exists because somebody wrote in and asked. If you ever hit something that doesn't work the way you'd expect, email me directly and it'll get looked at the same day. Rod, Founder of Zone2AI
Great UI
Response from developer
Thank you. The routine part is the harder half, so I'm glad that's the bit that landed. Zone 2 only works if it's easy to keep doing. Rod, Founder of Zone2AI
