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HR-based HIIT intervals

Status: New Submitted by on ‎09-28-2025 18:26
HIIT intervals: I reach a custom BPM max, rest to BPM min., repeat. Running city streets, with hills etc. timed intervals are useless. With F6, I must repeatedly check HR display while sprinting. Plus, intervals based on BPM are the recommended method. Vibrating when either BPM is crossed would be incredibly useful. w/GPS, 'cause not on a track.
This is needed because:
Existing timed HIIT interval alert vibrations ignore heart rate. Proposed intervals follow the recommended HIIT protocol of cycling of heart rate between moderate (around 55-70%) and vigorous (around 70-85%) - and allows customization (e.g. alerts at 66 & 82% max HR, or 57 & 75%, etc)
I'd use this: Daily
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