Most common:
* "Danse simplement" - This is the most literal translation and means "dance simply".
* "Danse juste" - This means "dance just" and is a more natural translation for "just dance" in the context of a dance instruction.
Other options:
* "Fais juste un peu de danse" - This means "Just do a little dance" and is a good option if you want to emphasize the "just" part.
* "Danse comme ça" - This means "Dance like this" and is a good option if you want to be more specific about the type of dancing.
The best translation will depend on the specific context of your sentence.