Reducing the appearance of cellulite
I’ve had fit and thin clients with cellulite and much of it is genetic. You can reduce the apprearance of cellulite, but there is very little you can do to remove it completely.
Staying well hydrated and reducing the salt intake will help. As will cardio and strength training to both burn calories and increase muscle development, though I don’t know of any research that says one over the other will aid in the reduction of cellulite more than the other.