I remember quite well when I heard this for the first time; it was in my teacher training and my only thought was: now she (my teacher) lost her mind.
I was sweating my heart out, my concentration at a peak, my muscles sore, my entire body a mess of tension. Ease? Really? I rather felt like made of concrete, ease was a term I wasn’t even dreaming of!
It took some time to get an idea of what this means, to find steadiness and same time ease in a posture. Stability and consistency without effort. When holding a posture, while being in correct alignment, there’s a certain moment when it feels just easy, almost like a relief! This is ease.
The best postures to understand the concept of steadiness and ease for me are headstand and handstand. There is this moment, when all of a sudden you feel weightless, your body is in every detail in the right alignment. As if you can stay forever in this posture, almost levitating.
This happens when it all comes together: concentration and an inward view through drishti (focus point), proper ujjayi breath, stability through activating the bandhas and correct alignment. For me it’s additionally about not thinking how to do a pose, but just do it.
Then your yoga starts.