Equanimity (Upekkha) is a balanced state of mind that is characterized by a benevolent attitude toward all beings as well as an accepting attitude toward the ever changing conditions of life. You may not be distinguishing between calm and equanimity in your practice. It’s skillful to be calm in your practice, and you certainly want to cultivate the ability to be calm. However, equanimity is a steady quality of the mind that can receive any experience without being overcome by it, even such emotions as anger, anxiety, or fear. It is through equanimity that you are able stay with and examine difficult mind states and learn to release them.