Are there excellences pertaining to the “practice” of being a human being? Give your arguments either to support or to negate the above statement.

Yes, there certainly are. In the Nicomachean Ethics, Aristotle outlines many moral and intellectual virtues which are key to the excellent life or the life well-lived. Virtues are habits that must be practiced. The more they are practiced, the more they are exemplified in the lives of human beings.