Another important aspect is that the masters taught us to move from a deeper source,not just from muscles and joints.
T. K. V. DesikacharIf we do not pay attention to ourselves in our practice, then we cannot call it yoga.
T. K. V. DesikacharIt is not only important how long your breath is. What is more important is how smooth and subtle it is. For length of breath without the accompanying subtlety is fruitless.
T. K. V. Desikachar