Instead of being swept in the spiral of negative thoughts like 'What if I fail? What will they think of me? try to be aware of your physical sensations: how your heart beats, how the air fills your lungs, the heat and sweat you feel.
This will anchor you in the present moment and calm your nerves.
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Recognizing and accepting the fact you're being nervous before an important presentation will help you more than trying to fight those anxious feelings. Resistance creates even more angst.
Once you do this, you can slowly shift perspective and try to reframe the situation in a way that favors you.
Exercise can reduce the body’s biological stress response. If this fits into your lifestyle and routine, go ahead and do it as part of your preparation for public speaking.
But don’t make the exercise a need you have to fulfill in order for a talk to go well. You want to be careful about having rituals, but not getting so attached to them.