I didn't understand what was going on... the Goddess pose was simple enough, yet my body was shaking and vibrating like a car with a wheel out of balance... our local circus community has been getting more and more into multi-tier human pyramids, and this day I was fully engaged in the practice. In the next few moments we deconstructed the pyramid into its component parts, and by instructing my bases to tilt their pelvises by only a few degrees, all the shake was gone, and I was my rock-solid self again!
In the past I've strongly favored partner acroyoga practice over group pyramids, but this day, Christmas Eve in fact, I learned many many new things from my full participation in the pyramid construction gang :)
First, as a base, typically with the weight of 2 or more humans bearing atop me, it required really perfect form and bone stacking technique. I've always marvelled and taken some small joy in the fact that with acroyoga basing, pure strength can compensate for slight misalignments and imperfect technique. But as the loads increase (one person, two people, etc.), the required strength becomes excessive, and the only "solution" to these human puzzles becomes rock-solid, perfect alignment.
Additionally, when the mid-tier or fliers places their loads on the proper structural points (sacrum through to feet, shoulders through to hands), it absolutely re-inforces perfect form; its like having an awesome yoga teacher push and pull your body into the correct alignment.
Which brings me to the second realisation, which has been entering my practice more and more via acrobatics: the "active" nature of poses. Once a yogi has achieved a decent degree of flexibility and body awareness, most asanas can be held with a minimum of muscular exertion... now enter "tightness drills." Whereas previously I had achieved a "lazy headstand" with near perfect bone stacking and balance, now I was being asked to hold that rock solid while a partner pushed, pulled, and prodded my legs with significant force. This required a new practice, known to acrobats and gymnasts as "one piece."; i.e. making the body completely rigid so that any force exerted on it would move it as one might move a marble sculpture. Now, instead of simply stacking and hanging out, I am focusing on tightening every muscle in my body, from fingertips to shoulders to abdomen to thighs to toes. This is a whole nother form of asana practice; and it also is very much required in pyramid basing.
The final realisation I got was that of micro-alignment and communication. While doing a mid-level pyramid asana, I was in Goddess pose with one foot on the sacrum of each of two bases. By instructing the bases to alter their pelvis angles by only a few degrees, I was able to transform my pose from shakey wobbly to rock solid. Similarly, when Todd was performing a headstand atop my back, his instructions to widen my shoulder blades by about a centimeter made a massive improvement in his ability to achieve the inversion. These accurate anatomical communications between all levels of the pyramid allowed us to achieve some pretty spectacular structures.
Always learning, always growing.
