I would just add that in yoga what is considered ‘certified’ follows a somewhat different model than in the other areas you mention. It used to be much more fluid, but in the past couple of decades it has become usual for people to take a training that covers specified basic material.
Yoga, unless you are teaching a form of fitness that has aspects of yoga, rather than yoga typically you want to get yourself on the yoga alliance registry. The alliance does not train and certify itself, but simply maintains standards and provides a way to compare across trainings. Anyone can pay a fee and become a registered yoga teacher, but to begin to teach typically one takes either a 200 or 500 hour training. T
If you want to teach asanas, or add elements of yoga to your regular classes then just start with your national certification.
Typically a national group exercise certification is the way to start for most fitness instructors, and some also take a degree, though a good national certification is generally what is required in most places to teach.