Calculated from 32 activities, confidence index: 88%
Easy effort, active recovery. Conversation pace.
Comfortable endurance. Can speak in full sentences.
Comfortably hard. Marathon to half-marathon effort.
Hard. Sustainable for 30-60 minutes in a race.
Maximum effort. Short intervals only.
How your training time was distributed across zones based on the analyzed activities.
ZoneSense analyzes the heart rate distribution across your recent workouts. Instead of using the generic “220 minus age” formula, we look at how your heart rate actually behaves during training.
Your Maximum Heart Rate (186 bpm) is derived from the 99.5th percentile of all recorded data points — this filters out spike artifacts while capturing your true max.
Your Lactate Threshold Heart Rate (168 bpm) is detected by analyzing where the intensity distribution drops off sharply. This is the intensity you can sustain for roughly one hour — the foundation of the 5-zone model.
Zones are calculated as percentages of your LTHR using the Joe Friel methodology, widely used by coaches and athletes worldwide. With 70,000 data points across 32 activities, this analysis has high confidence.