Valleyball --> Volleyball It can be countable or not. If it is ongoing, you would not count it. But if you want to talk about a specific number, you can count it. Today my daughter had volleyball practice. She is a member of the kid's volleyball team, and they have practice 3-4 times a week. (non countable example) Today my daughter had volleyball practice. She has three practices this week. (countable example)

It can be either. To be honest, I would not use 'a' with the first example. I would just say 'she had volleyball practise'. But - I don't think it's wrong. You can use it as countable if you need to specify a number, e.g. 'we need to have a practise before the dress rehearsal'. BTW - you've spelled volleyball incorrectly. One o and one a.