Am I good enough to start teacher training?
Being good at yoga is not so much a matter of flexibility but more a matter of understanding, and this comes about through a union of practice and study. Furthermore, it is not just practice and study that are important but how you practice and study.
Robot-style emulation of postures and parrot-style repetition of the yoga (party line style) philosophy are not the way forward; one needs to bring yoga home. Bringing yoga home means staying open to your experience of practice surrendering your views and opinions to the reality of applied practice. This I have found does not lead to a rejection of traditional yogic philosophy but a deeper understanding of it.
Furthermore, one will be able to sift through the multifarious teachings of yoga to find the real gold, to discern genuine yogic teaching from social and cultural conditioning. The great thing about yoga is that it is applied, so that outmoded or dogmatic views will be cleansed in the fire of practice, as implied by the Niyama Tapas (tap=to heat up).
All of this does require a certain amount of trust and commitment on the part of the yoga student to go beyond the apparently safe, protected world of a follower to the dynamic living world of the open-minded explorer. This attitude changes yoga from point of view to creative relationship with both practice and life itself.
Regarding teacher training, there are many routes to take: weekend-long, week-long, month-long training courses that require more or less prior contact with yoga and sometimes more than one teacher, but these can be lacking in depth and personal integrity. Having a longer period of time where training as a teacher occupies a central position in your life allows you to own it more, to make a personal relationship with yoga and your teacher.
One advantage of having one teacher is that you can pick up their language and method or style of expressing yoga, so that you can travel in deeper to the experience of yoga rather than just staying on the surface of the practice because you are having to re learn different expressions for what may be essentially the same experience. Because of the importance of longevity and connection with your teacher one has to feel that one can trust one’s teacher and that one has a certain personal resonance with the form and method with which they express yoga, so it is important that the interested party has tried a few different teachers before one settles down with the one who fulfills the above needs.
There are many different schools offering teacher training courses: Iyengar, Scaravelli, Sivananada, Satyananada, The Life Centre, Bikram, Dru as well as Vajrasati and a great many more besides, so check out what each one is offering, go to some classes and find which one best suits you on the above levels and then make your commitment. All schools will except you if you show the right level of commitment, which again will vary from one school to another (a school that requires a high level of commitment is a good sign as this might mean that they understand the importance of giving your whole self to your practice - as expressed by the Niyama Ishvara Pranidhana - but check to see what there explanation for this commitment is).