Ray Long, a certified orthopaedic surgeon and founder of Bandha Yoga, is the author of Key Muscles of Yoga, and he believes that a basic understanding of the musculoskeletal system is beneficial to yoga practitioners to “optimize practice, break through blockages and avoid injuries."
This was one of the anatomy texts that was required reading for my YTT-200, and it was chosen because it specifically presents key muscles in the context of yoga poses so that we'd understand what a muscle is doing in a given pose. There is not a lot of text, and tons of great images of the human skeleton, the work of digital illustrator, Chris Macivor.
For those that have a tough time in grasping the fundamentals of anatomy, Key Muscles is an introductory text most helpful in reinforcing key concepts. For example, the description of the basic function of joints does not go into the complexity of joint mobility. Leslie Kaminoff and Amy Matthews’ Yoga Anatomy make a strong argument about going beyond the traditional understanding of joint movement as a ball and socket or a hinge, in order to awaken ourselves to the full-range and potential of our movements. Here we are given the foundational understanding and like any good introductory text, it gives you a strong starting-point to explore further.
Key Muscles of Yoga has three parts to it. Part 1 explore the pelvic girdle and thighs, Part 2 the trunk and Part 3, the shoulder girdle and upper arms. It introduces the reader to the terminology for the locations on the body, the skeleton, joints, ligaments, muscles and tendon and movement concepts. Getting to see the skeleton in yoga poses is a great visual - you see exactly how the hip internally rotates in garudasana/eagle pose, or how your gluteus maximus, largest of the four muscles out the outside of the pelvis, contracts in purvottansana/upper plank pose.
Highly recommend.