Break a workout into heart rate zones
A 27-minute walk split across Fitbit's heart-rate zones and compared with the user's usual walking pace.
Captured April 2026
The workout record
Fitbit records time in each heart-rate zone for a workout. The assistant charts those minutes and compares this walk with the user’s usual walking pace.
The prompt
Show me a visual breakdown of my heart rate zones in my last workout.
The response
Show me a visual breakdown of my heart rate zones in my last workout.
Executing my_fitbit_data.get_workout_sessions - Out of range under 50% max HR
- Fat burn 50–69%
- Cardio 70–84%
- Peak 85%+
Strong session — that 27-minute walk on April 22 was much more intense than your usual pace. You spent 9 minutes in cardio zone and 3 minutes in peak, which together is about 44% of the workout in serious training territory. The fat-burn 10 minutes likely covers your warm-up and cool-down. Average HR of 135 confirms it — well above your typical walking pace.
If you can hit this kind of zone distribution two or three times a week, you’re getting real cardiovascular benefit. The peak time especially helps with VO2 max over time.
Compared with the usual pace
This was a harder walk than usual, not an absolute judgment about fitness. The response infers that the fat-burn block covers the warm-up and cool-down, and labels that as an inference.
