The intensity distribution shows you quickly and precicly the intensity of a training or a certain period of time.
It is distinguished between 3 intensity levels - low, medium and high.
The intensity levels result from the zone definitions, which you can create for corresponding time periods.
Measured is the time distribution of the intensities, not the distance.
The total time for the zone type is shown in the card header.
There is controversy over the best distribution of intensities over one certain period when it comes to increasing endurance and speed.
According to the 80/20 method popularized by Matt Fitzgerald, among others, 80% should be trained at low intensity and 20% at mostly high intensity. In addition, other sources show that polarizing training has the best effect, so moderate efforts should be avoided.
However, exceptions prove the rule, and there are athletes who seem to get the most out of training mainly with relaxed-pace runs. You may also want to avoid all moderate and high training intensities first. With the intensity distribution and a good zone setting, you can find out for yourself.