Yoga

Hello Subhajit, You need to check whether the university is UGC/ government approved or not? The candidates who have completed post-graduation from recognised university are allowed to apply for the exam. You can find the list of the approved universities and name of the fake universities at the official UGC Website. The candidates of distance learning are also eligible to apply for the exam. Also the candidates can choose the subject of their post-graduation to apply for UGC NET or its related subjects only.

Hi Sunita,
Kindly refer https://www.shiksha.com/humanities-social-sciences/articles/delhi-university-pg-admission-2018-list-of-courses-selection-criteria-seats-available-blogId-17035.

Yes, there is Ph.D in yoga or Physiotherapy.

Yes, you can apply for NET.

Yes, you will be accepted. There is no such things lateral or regular. If you have Masters with prescribed mark by UGC, you can apply.

You can open your own academy, and you can take tuition class for these subject and you can join membership for it.

http://www.universityofpatanjali.com/wp-content/uploads/2017/07/MA-Yoga-Science.pdf
The Admissions were closed in July and the above link is to their list of admitted students on their website.
Universities in India has closed their Admission in the Graduation and Post Graduation Courses and the same is with the Colleges Affiliated with them. However, PhD Admissions are open at some universities. I am sure you want to know NOT of PhD.
The option to join courses is Distance or Correspondence mode now. IGNOU shall also be an option to do Open Education/Distance Mode Learning.

Hi,
You can pursue Diploma in Yoga after class 10th.