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. 2019 Sep 9;49(12):1825–1836. doi: 10.1007/s40279-019-01173-y

Fig. 4.

Fig. 4

A group of Judo learners. As the belt colors change (from white/right to black/left), so each individual’s expertise level increases (and presumably so do action boundaries). Note also the variation in age, size, sex across individuals in the group