Answer:
channeling your nervous energy
Explanation:
In public speaking people get nervous because of the act of speaking in front of an audience. The main reason for people getting nervous is the reaction of the audience when they speak.
Speakers generally have a routine which distracts them from their thoughts and prepares them mentally for the task at hand. This routine is personalized for people but relaxing one's muscles is a common routine to channel one's nervous energy.
