Learn Finnish: Pidättekö te urheilusta?

The verb pitää (to like) always requires the thing you like to be in the elative case. This means you must add -sta or -stä to the end of the word. Here, urheilu (sports) becomes urheilusta.

Doesn't the verb pitää also mean 'to have to' or 'must'?

Yes, it does! Pitää is a versatile verb. You can tell which meaning is intended by the grammar around it. When it means 'to like', the thing you like is in the -sta/-stä form. When it means you have to do something, it is paired with an action verb in its basic dictionary form.

What does the -kö at the end of Pidättekö do?

It turns the sentence into a yes/no question. To ask a yes/no question in Finnish, you take the main verb, add the question particle -ko or -kö to it, and move it to the very front of the sentence.

Do I need to include the word te, or is Pidättekö enough on its own?

You can safely drop the word te (you, plural/formal). The verb ending -tte already makes it clear who the subject is. Including te is still very common, especially if you want to emphasize who you are asking.