Why does Arjuna refer to Krishna as a yogi?

Among the many names that Arjuna uses to address Krishna, one of the most intriguing is yogi. The word refers usually to ‘a practitioner of yoga.’ Krishna is not generally included among such practitioners. He is, after all, the ultimate reality, the supreme object of yogic meditation. Emphasizing his unique position, he is sometimes referred to as yogeshvara, which can refer to him as the Lord of yogis or as the Lord of mystic powers, which are attained by the practice of yoga. 

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