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Hi Sahil,
To become a fitness traineer no prior education qualification is required, but minimum age of 21 is mandatory.
Please explore Sports Authority of India (SAI ), NS South Centre, University Campus, Bangalore for a certification in Personal Trainer/ Gym Instructor .Nike Aerobics Course and Reebok Instructor Certification programme (www.reebok.com ) are also held from time to time in Banglaore and they advertise it through the local newspapers.
You can refer the link for colleges:
https://medicine.shiksha.com/public-health-courses-in-india-categorypage-5-237-1-0-0-1-1-2-0-none-1-0?
Hope it helps. Please feel free to revert. Click on the thumbs up or mark it as the best, if you found this useful.
Wish You Luck!

Praneeth, If you're creative, you can always consider going for Design and Animation. This is a field where nobody cares for your qualification, they only see if you can do quality work. In fact, the University Model has not succeeded in any Skill field across the world. A good mentor and wise selection of courses with a good school, followed by diligent learning, would get you a head start in your career. However, you must check your suitability for this field. Animation is an art form and a very demanding career. It has ample opportunities for the creatively talented people. Opportunities lie in UI Design, Graphic Design, Storyboarding, Animation Design, Game Design, 3D Modelling, Texturing and Lighting, Dynamics and VFX and of course animation (2D and 3D). Of course at the top of the pile lies Concept Designing - these people are required by Event Companies, Animation Studios, VFX Studios, and of course Game Studios. However, choosing between these must be done after seeing your performance in each of these. So going for a generic course covering all or most of these would be the best way to get started in these careers. Typically you should have good sketching skills to be able to make a sound career in this (if you work hard you can improve your drawing skills tremendously). You may also like to read this about the kind of preparation the best students put into design http://bit.ly/1ddUSi8. Nothing but your innermost talent and passion should lead you to the course and the institute you choose. Go speak to people over there and see if you like their philosophy and they change your perspective.Try their website for more details. Also remember that Animation requires good mentoring. Typically go for a school which offers all the information including faculty on their website. Here is an article by Arena Chandigarh Centre Head on Shiksha website about how to select the right college https://www.shiksha.com/questions-to-ask-before-you-pick-an-animation-college-article-4699-1. And here is a complete snapshot of Gaming Industry by me on Shiksha website https://www.shiksha.com/from-gaming-to-game-designing-article-5827-1. Wish you the best for your career. Remember, your Career is a resultant of your knowledge combined with your passion and expression ability. If you like this answer you may select it as best answer or press like

Assuming your category to be general. It is not sure that you would make it to the top NITs or IITs. You must be having a home state quota. Make use of that to get good branches in NIT of your state.
As far as branch is concerned, it entirely depends upon the choice of an indivudual that which branch he/she likes or the subject in which the person has certain fondness.
So choosing A branch depends on you.
Abhishek, if you are specific about choosing a particular branch and if you don't get it in NITs or IIITs, then you can also refer to cetain private colleges for your admission on the basis of your JEE rank.
For getting an idea about which branch in which college you can get based on JEE counselling, please follow this link:
https://www.shiksha.com/jee-mains-college-predictor
If you find this answer useful than click the thumbs up icon or choose it as the BEST Answer.
Good Luck.