At the moment, the CHO/FAT breakdown and percentages are only shown for the entire activity. For structured workouts or substrate testing, it would be extremely valuable to see Fueling Insights per lap, interval, or user-selected section of a workout.

This would allow athletes and coaches to:

Compare substrate usage across different intensity blocks (Z2 vs Tempo vs Threshold).
Run field-based substrate tests without exporting and splitting FIT files manually.

Better individualize fueling strategies for specific race scenarios.