power/larger mechanical power/lower energy cost/lower hydrodynamic resistance/larger propelling
efficiency or a combination of afore mentioned factors. Between those, ankle flexibility seems to be
a negligible determining factor which was demonstrated by the small correlation coefficients. On
the other hand, ankle flexibility does have an influence on the velocity. After the application of the
anti-supination tape, which significantly restricted the plantar flexion and internal rotation, the velocity
and frequency of the kick significantly decreased, resulting in a drop of performance, which was
also apparent in the decreased distance covered by cycle. This intra-subject comparison, where the
influence of all other confounding factors was negligible, did indeed show a reduced efficiency after
restriction of the flexibility.