This is what one of my students have told me. Sounds very sound:)
When we squat up and down - obviously quadriceps are working a big deal. When we sit in the chair pose for few minutes, there is no gross body movements is seeing and no obvious muscles contraction is observed.
I’ve read somewhere ( my fault that I never keep my sources) that when we are holding the pose - the muscle still contracting but at the more subtle rate and pace.
Any info on this would be greatly appreciated.
CM