I’ve just started a blog devoted entirely to the jump back and jump through. I’m getting there but still struggling. My hope is that people will come with advice and suggestions and that this will benefit not just me but anyone else finding it difficult. Here’s the link
Ashtanga Jump back
I know many will say that the jump back isn’t essential but I’ve found so much benefit from working on it that i really feel it’s worth the effort. For example I’ve gained a much better understanding of Uddiyana bandah, of shifting my body weight, my sense of balance. I’ve gained strength but also the awareness that the jump back isn’t all about arm or even core strength. i feel that the time i’ve spent focusing on this is helping me in almost every other asana in the ashtanga Primary series.