To set favorite exercises in the Six Pack App go to the menu by tapping the icon in the upper left corner or swiping the screen from the left to the right. Choose „All Exercise Videos“.
Open your favorite exercise by tapping on it. There is a star at the bottom right corner - tap it to set the workout as one of your favorites.
View all favorite exercises:
Go to the menu again and choose "All Exercise Videos". Tap "Filter" in the upper right corner and set the star as your filter. All your favorite exercises are shown.