I suggest going for it. There's a big range of levels in the teacher training classes, and intention as well. Some people take teacher trainings because they are aiming to teach, while others do it to deepen their own practice. If you're interested, I'd say come in to check the place out (it's wonderful), and take a couple classes from the teacher training instructors who teach here regularly. You'll also have a great opportunity to talk to more students who've been through the program.

I wouldn't worry too much about where you are now in terms of weight and ability. From hearing what you already do, I think you have more than enough experience to make the most of the program. And you'll be working with asanas and building your skill level in the classes (I definitely recommend taking what regular yoga classes you can at the studio while you're doing the training program).

The next session will be starting in the spring.

I work at Avalon on Monday evenings, so feel free to send me a message if you have more questions - I only check in on the board sporadically.

Good Luck!!