The other side could counter that a feather has no muscles; nothing that makes it move independently. Whether attached to the bird or lying on the ground, the feather is still.
In my mind, both arguments are correct. In my daily life application, both ways of thinking are necessary to becoming more mindful. Unlike the feather, most of us can choose what moves us and how. Each time we take a walk, participate in an exercise or yoga class, jump into the crisp ocean, sprint, or hop on a bicycle, we consciously choose movement. When we can define a purpose for our movement, such as coping with stress, building strength, or improving the flow of the breath through the body, we are mindfully moving. Most of us are able to find a level of physical activity that works for us, define what it does for us and find peace with it.
For many, it is much more difficult to find and learn to appreciate stillness. Stillness asks us to slow not only the body, but also the mind. Stillness, like a hand on the shoulder urging us to just sit, asks us to be with what is sometimes uncomfortable. It asks us to turn away from the "rational" mind, or the ego, with all of its labels and answers. In stillness, in meditation, we train ourselves to listen to the heart, to what we sometimes perceive as "irrational". When we really listen, we find purpose here, too. When we mindfully give our attention to our hearts, we begin to hear different ways to look at "what just is". We find ourselves dreaming more, and settling less.
And so, our work becomes how to balance movement and stillness. The ratios are different for each of us. The answer may lie in what makes us recoil. Like the feather argument, I won't take sides. In my personal opinion, we need movement and stillness. The needs wax and wane depending on what is happening in our lives. We know when we strike a balance. There is a feeling of stability, a sense of peace; the kind of "good tired" we feel after a day of gardening or enjoying the beach. Today, I wish for you that sense of balance. May you find meaning in movement, peace in stillness.