LeBron James takes three slow, deep breaths at the free throw line before the ball leaves his hands for the net. He then stops, focuses intently on the net, and visualizes him making his shot successfully. It's a clean shot.
Likewise, the classical cellist Yo-Yo Ma, clenches and releases his fists and rolls his shoulders before striking a string in order to release the tension in his body and devote all his abilities to playing a skillful piece.
Though these actions may seem trivial, they will help in your endeavour to living "anxiety-free":