If the Hammer is the person in our lives we can trust to tell us the truth, in the way that we need to hear it, the the Heat is that individual we can count on to ask us the tough questions.
Are you on a diet? The Heat might be that person who asks what you had for lunch today. Trying to become more physically fit? The Heat might ask you how much time you spent in front of the TV today. Planning on testing for shodan this summer? How much do you really train your kata? Regardless of your goal, the Heat is going to ask you that terribly uncomfortable set of questions that you NEED is order to grow. Who do you trust to bring the Heat?