Why can I only mark some activities as done?

Your organiser set those as one-click activities with a fixed amount. Do the activity as the challenge describes, then tap Mark as done to get its points.

For example, a yoga entry might stand for at least 30 minutes of yoga. You can’t change the amount, only mark it as done.

In habit challenges, such as drinking water or a daily workout, you tick off each habit in YuMuuv every day. You don’t need a watch or tracker.

If the fixed amount looks wrong, ask your organiser. Admins can also use a one-click activity to give points, for example for attending an event.