Ruby is a fabulous back archer. So fabulous, in fact, I had to quit placing her in the bouncer because she could simultaneously arch her back and extend her body in such a way I frequently turned around from the stove/sink/laundry/sibling and found her with her head on the floor behind the bouncer with her feet securely hooked to the three point [keep your kid in the seat] harness.
I still think he could be correct with his assumption. And I wonder if Ruby is using yoga to keep herself flexible until she finds a high dive.
You know. After she learns to walk.