“…12,27,34,35,[38][39][40] Five articles focused on tennis (forehand stroke, 35,36 serve 2,33 and both the forehand stroke and serve 34 ), five articles on table tennis (forehand stroke, 3,6,25 backhand block 38 and block 27 ), four articles on badminton (smash, 39,40 backhand long serve 4 and smash and drop shot 12 ) and one article on squash (forehand drive, backhand drive, volley and drop shot 5 ). Between 1 4,33 and 20 38 players participated in each study, with seven studies focusing on adult players (mean age of over 18 years), 2,3,6,25,36,38,40 1 study focusing on junior players (mean age below 18 years) 5 while the age of the players was not specified in the remaining studies. For the player level, experienced players (level described as being able to accurately perform the different stroke techniques) were used in nine studies, [2][3][4][5][6]25,36,39 amateur level players (level described as being able to not accurately perform the different stroke techniques) were not used in any studies, while five studies included both levels of players.…”