Yes, flexibility of body and physical perfection for Yogasana is important. However more important is the state of your mind, Meditative mind. Your flexibility might be excellent but if your mind is not attentive, you are merely doing some physical exercise, not Yoga.

Knowledge of yoga is no substitute for practice.

Love begets courage, moderation creates abundance and humility generates power. Courage without love is brutish. Abundance without moderation leads to over-indulgence and decay. Power without humility breeds arrogance and tyranny.

If you balance in the Present, you are living in Eternity

We often fool ourselves that we are concentrating because we fix our attention on wavering objects.

As long as the body is not in perfect health, you think about it, and that prevents you from thinking of the mind. The sound mind is a sound body.

Faith, courage, and intelligent and uninterrupted awareness - these qualities are to be present whether one is wide awake, half asleep, or in deep slumber. An individual who lives like this performs his daily actions with a mind free from selfishness. This is poise in action. And this poise leads to that serenity which is in the truest sense a healthy mind in a healthy body.