Participants of the experimental group received the instruction to use the self-talk for technique “when I throw the ball, the arm goes back, over the head, look at the target and hit the ball…” which was replaced later with “target, throw, and hit…”.
In the beginning of the training, coach reminded them to use self-talk out loud.
Participants of both groups performed four drills (X10 services) in each training session for
improving the service technique.