Ah the tangled webs that we weave.
My inquiry as to “best” was a clarification question to the OP.
To some, best means they can get a yoga teaching “job” immediately. To others best means popular. In this case the OP responded appropriately about his definition of best.
I have several very close friends who are currently Personal Trainers. The two that come to mind have similar backgrounds to the OP - a biology degree and appropriate professional certifications for their industry. Both are very good at what they do.
I would, however, use care with this sort of statement:
the Yoga instructor is more or less always clueless, much much less competent that your average fitness instructor.
That having been said, I agree with the basic premise (not the premise in contrast to trainers) which is that there are many and some do not have proper training to be able to work safely with injured students. This is a function of a) an absence of yoga teacher regulation and b) the presence of “teacher training” businesses that crank out several thousand “teachers” per year.
Coming back to the OP’s question…there are teacher trainings that have robust curriculums which include A&P. The process is much like finding a college. You can go to beauty school, community college, a four year school, or get a masters.
The programs that have additional hours (the one I am working on is 2,000 hours) obviously have additional room for material to be covered. Most people do not take yoga instruction seriously enough to commit to anything over 200 hours, some not even that commitment. Therefore it depends on one’s intention. Look deeply into the syllabus.
The first teacher training I did back in 2000 had very little to offer in terms of A&P but it was an eight day boot camp (as I was unwilling to commit to more). It was fine for where I was then, today it would be fun but educationally insufficient. My current program exceeds my anatomy expectations.
The Yoga Alliance has a spot on their web page where you can search for registered schools. This isn’t the only valid way but it’s a good start.
One last thing, and that is this “I feel ready” piece. The mind is a crafty master - unless you’ve done the work to make it a servant. And thus it can make you feel however it wants. This is how ego rises in the practice. For weight training ego is completely acceptable. Perhaps even desired. In yoga it has no place. This is not a good/bad evaluation. The feeling of being ready to teach, be it brain surgery or yoga FOLLOWS training and education. it is possible, in certain contexts, to be an amazing yoga teacher without this sort of training but it is remote and unlikely.
You may find additional relevant info on my FAQ section.