Workout Days Complete not showing?

Hello,

don't know if this is an actual issue or if I'm misunderstanding something:

In my Statistics & Trackers section, I'd expect the number for Workout Days Complete to show me how many days I've worked out? However, since starting the Plus version, it's still at zero although I've done about a months worth of workouts.

So, I'm a little confused whether this is a glitch or if it's meant to show something else?

Thanks,

Ivona