I am using third party apps to record MAF and Zone2 activities. I would love it if this alert was pre-integrated into the Strava app.
the MAF idea is easy, you take the age of the athlete and subtract it from 180, then prompt for other sub categories such as overweight, injuries (subtract an extra 5) and arrive at their targeted MAF Heart Rate and have the App alert the athlete when they exceed the heart rate so they can slow down and stay on track.
For Zone 2 alerts, record the athlete speak into the device's microphone and record a small phrase that equals 1 1000, 2 1000, 3 1000, 4 1000, 5 1000, 6 1000, 7 1000, 8 1000 if they take a breath from 6 1000 and onward, that is their Zone 2 max heart rate/pace if they take a breath before 6 1000 then they are cycling or running too hard and need to back off. have the runner re-calibrate every few weeks if they are training 3 or more times per week, and if they stop training have them re-calibrate to get an accurate measure for their Zone 2.
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