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. 2017 Nov 3;8:1931. doi: 10.3389/fpsyg.2017.01931

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Copyright © 2017 Buszard, Reid, Krause, Kovalchik and Farrow.

This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) or licensor are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.

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(A) Between-skill and within-skill variability values for every serving drill by each player in Study 1. A 2-D density plot was added to the figure to highlight the most common between-skill and within-skill variability values. A value of 0 represents minimum variability whereas 1 represents maximum variability. (B) The percentage of drills that featured zero between-skill variability for each player in Study 1. The number of drills assessed per player were: M1 = 2, M2 = 8, M3 = 2, M4 = 7, M5 = 4, M6 = 5, M7 = 6, F1 = 15, F2 = 5. Hence, the two players that did not experience any drills with zero between-skill variability had the least number of serving drills assessed.