In the first training unit, after the warm up, participants performed a set of five trials (warm up in service).
Afterwards, the evaluation test of service was conducted.
The participants performed 10 attempts, while in the mean time all the attempts of participants were videotaped.
The instruction that was given to all participants before the attempts was: “do the best you can...”.
The video camera was placed 6m distance and in 45o angle on the right of each participant (if the participant used the left hand, the video camera was placed in the left, in the same distance and angle).