Specifically, cardiorespiratory endurance refers to the ability of the heart, lungs and circulatory system to deliver oxygen to working muscles for sustained periods of time.
The ego is  your consciousness of your own identity, or the conscious mind. Basically, your ego is related to your confidence level; if you have a big ego, your confidence is high, and visa versa. Additionally, having an ego can mean having an inflated feeling of pride or self-worth. The ego is your consciousness of your own identity, or the conscious mind. Basically, your ego is related to your confidence level; if you have a big ego, your confidence is high, and visa versa. Additionally, having an ego can mean having an inflated feeling of pride or self-worth.
Together they make up the personality. According to this model of the psyche, the id is the set of uncoordinated instinctual trends; the ego is the organized, realistic part; and the super-ego plays the critical and moralising role. The id, ego and super-ego are functions of the mind, not parts of the brain. They do not correspond one-to-one with actual structures of the kind dealt with by neuroscience.