Talking involves breathing which you already know but can you direct your breathing as you are talking. Start by talking or praying or counting on your back as your partner walks with his fist on your body and follow this with your back off the ground. Continue by doing this while standing and having a partner or more push you and follow this by hitting and both of you hitting. Note if your voice changes and where do you generate it from. A good measure to do this is to work on speaking (praying has an added value and if you don’t pray simply use a positive affirmation such as the world is a nice inviting place and this will clear you to see more of what is already near you) without stop. This forces you to speak on the inhale as well and you will gain awareness and thus relaxation and control out of this practice.
Use the axioms of Vigilance & tranquility