Figure 1. The SL–SF combinations in each section of the clean swim phase and finish during the 50 m Freestyle event for senior (left panels) and junior swimmers (right panels) for each group (group #1 – better performers; group #2 – worst performers). SL – stroke length; SF – stroke frequency; Group #1 – best performers; Group #2 – worst performers. In the bottom right corner of each race section (group #1: senior and junior), the SF–SL combination of the fastest eight swimmers are presented. The combinations of the fastest eight swimmers (i.e., best final race times) in each section of the race are also shown.