Hi Karina. I must have missed it but I didn’t see what certification you were asking about. However, based on the answers of other posters, I’m assuming you’re asking about bellydancing – correct? If so, my response would be that having this ‘specialized type of certification’ can help set you apart from other group exercise instructors and thus perhaps make you more marketable to local gyms. If you love it, do it! Your passion for it will come through in your interviewing for an instructor position, as well as in your teaching.