To start the Shot Quality challenge you have to take the following steps:
Open the Mingle Sport app and go to the activity screen
press the blue button in the right corner
Select Shot Quality
Press on start session
That's it! Now you can start playing the minigame. Want to play together? Add the (guest)players to the session and improve yourself!
Note: The mini-games are only available for IOS for now. The minigames for Android are coming soon!