by Baxter There is a lot of talk these days about developing core strength for benefits such as better posture, less back pain and better overall body strength. When I started doing yoga in the mid-90s, I never gave this much thought, perhaps because core strength was not all the rage then but also because I found that my well-balanced yoga classes were already cultivating strength in the areas that I consider “core” musculature. So what are those areas? The most obvious ones are the focus of many exercise or Pilates mat classes. I’m referring to the four layers of the front abdominal muscles, from the most superficial and famous six-pack known as the Rectus Abdominis, the next two diagonally oriented layers, the External and internal Obliques, to the deepest corset-like layer, the Transversus Abdominis. And this is where a lot of the focus in other core strengthening sometimes stops. But I also think of the lower back muscles, such as the Erector Spinae and the Quadratus Lumborum (som...