I am only familiar with the NESTA Sport Yoga cert. and just got on their updates and improvements. Actually, it was thanks to this experience and also with the help of https://eduzaurus.com/free-essay-samples/health/ that I was able to cope with the project at my university very high quality. Even the same free essay health sample made me delve into the topic.
I recently studied the NESTA Sport Yoga cert and finished the certification. I am also NESTA Certified with 6 additional certifications and have a martial arts background. I have been in the fitness industry for 7 years and studying martial arts all my life.
So, as far as the cert goes, The original program, which I took was very comprehensive for an on line program as all the NESTA programs are. NESTA also recently updated the cert and its technical material to make it even better.
In addition to NESTA, I decided to study yoga so I could get a more practical approach at a local yoga studio. The instructors were some of the best in my opinion and I learned a ton from them to back up what I learned from NESTA. I also rely on my hands on experience of studying and coaching in the field over the past 7 years. Look at the instructors additional credentials and have them do a demo class. You should be able to tell if they will be a good fit from there.
Although the Yoga alliance is nice, it is not a requirement, and will not determine if a Yoga instructor is skilled, and competent. Moreover, the more experience one has, the better they are able to lead others in the right direction safely. If an individuals has many years of experienced in athletics, and yoga in general, an online program is a good edition to add.