Hey again, thanks for the review and feedback!I totally agree, auto selecting the workout start and end times is something I’ll do in the next update. Unfortunately I kind of need to re write most of the app in the more modern UI framework haha. I’ll try to get around to it soon.
Regarding your HR Drift question:
HR1: Average heart rate for the first half of your run. (including all data points)
HR2: Average heart rate for the second half of your run. (including all data points)
HR Drift: I think this is where people often get tripped up. HR drift is actually the pace to HR ratio of the first half / second half, this is why the app needs your distance data. If you do a drift test on a treadmill, you need to keep the speed the same for the entire hour, if you do the test outdoors, you need to try to keep your HR the same. The difference is on a treadmill, your HR goes up, if you’re outside, your pace goes down.
A simpler way of saying this is that if you run at 140bpm outside for 1 hour and your total distance in the second half is 5% shorter than your total distance in the first half, then your AeT = 140 bpm.
The app doesn’t support treadmill tests yet but that’s on the list.
Based on your screenshot, it looks like your HR went up in the seconds half, and your pace went down, leading to a drift of 5.63%. The problem is that your HR went up so the test is not perfectly accurate, but it’s a safe bet that 138 is pretty close to your AeT.