Hey ​@Przemek Siczek,

Favoriting an athlete will place their new activities at the top of your activity feed.
To receive a notification each time the athlete uploads a new activity, be sure to enable the separate 'Turn on Notifications' option for the athlete.

Please note: Managing your favorites can not be done through the Website. This is only done through the Mobile App.

If your notifications are on and you still do not see your favorited athlete newest activity, it could be due to the privacy settings the athlete has active.

I hope this leads you into the right direction. More information on our Favorites feature can be found here.