I’m looking for a simple zone training app for my Apple Watch.
Basically I want to set my upper heart rate boundary and lower heart rate boundary.
Start a workout, have it hollers when I hit my upper heart rate boundary, then I rest until I hit the lower bound, and it hollers and I start working again.
a quick DuckDuckGo search surfaces this one as one of the most mentioned apps.
Ismoothrun is great for this.