The Superhero Training Academy

The Superhero Training Academy was a so-called day camp that would make kids become very strong. Greg and Rowley wanted to do it so they could overpower Leon Feast and his friends, but they realized it was a scam. They were stuck there for a week and had to participate in lame activities like the wall smash station. And at the end of the week, Greg and Rowley only received some lame certificates saying Greg was a superhero for showing good manners during snack time.

Trivia

 * Since Greg's certificate mentioned "snack time," it can be assumed that the program was targeted towards young children Manny's age, and also because they wouldn't know that it was a scam.