My grandkids love Stomp Rockets! They are great for teaching STEM skills, such as cause and effect and trial and error, and very fun! In order to launch the rocket, kids jump on the plastic box, forcing air through the blue tube, and launching the rocket into the sky. There is a stand that comes with the rocket, but it's not very sturdy. Fortunately, the kids enjoy holding the rocket while they launch it (unfortunately, that makes it easier to point the rockets at each other).
If you want a fun science activity for your students, I highly recommend Stomp Rockets!
*Stomp Rockets sent me one to review, and guess what? We already owned some. They are just that great!