Biorhythms

I read a piece on yantra yoga, or the study of mathematics, geometry and symbols in yoga. I do not know a lot about it, but one item caught my attention: biorhythms. Someone did a biorhythm chart of me a long time ago and I was intrigued enough to look it up on the internet again. A biorhythm chart illustrates the principle that we are influenced by physical, emotional, and intellectual cycles. I have attached mine here because it was very interesting that I'm struggling physically in yoga the last few days, and my physical curve (red) is at its lowest point.