How this goal works ?

[fa.ce]

Just wondering: how to reach this goal ?
I've reached more then 5 sessions (5x15 minutes walking sessions completed) but the goal is not gained, why ?

 

[Julien]

The Hollow Gold Activity Stars are for a different workout activity. You need to do a different workout, like elliptical to get a new Hollow Gold Star.

 

[fa.ce]

Which other workouts work to unlock that Hollow Gold Activity Stars?
Running outdoor works ?

 

[Julien]

Which other workouts work to unlock that Hollow Gold Activity Stars?
Running outdoor works ?

Any one you have NOT already done. Then you will get another 'blank' Hollow Gold Start to fill in for the next Activity you have NOT done yet.