fit18 ellie eilish

It seems like you might be referring to "FIT18," which could be associated with workout routines, and "Ellie Eilish" may be a typo for "Billie Eilish," the popular American singer and songwriter. If you're looking for fitness routines inspired by Billie Eilish's performances or her lifestyle, I can help suggest some ideas! Alternatively, if you're asking for specific information related to either topic, please clarify so I can assist you better!