Walk toward your partner and hit him once as you continue to move. Meet him again and hit him twice as you keep moving and continue till you reach five, ten or whatever number you are comfortable with and than climb down. As you strike use one of the breath phases and keep it throughout the exchange. For example if you strike five times you lengthen the inhale, exhale or one of the pauses for the duration of the striking and so on. This gives you better awareness to working through being hit and hitting withing theses phases and teaches not to be dependent on one of them for doing any work. Note if you strike better when you exhale on the first run of this drill and make sure you are aware of changes. If you have a partner who can watch and give comments it is great for him and yourself to better learn and read body language.