When reading a text, give them reading rules to spice things up. The sillier the better.
For example, every time you read a word with the letter a in, you have to read it twice.
Every time you have a word with an e, you have to stand up and sit down.
If you have a word with an a and an e, you have to read it twice and of course stand up twice .
You can make your own rules and combine multiple rules to increase the difficulty level for them, depending on age and skill level.
You can turn this into in a competition