Swimming strokes are mentally organised as motoric actions under the condition of (flow) physics and limited energy reservoirs. Action representation is imagined to be organised hierarchically in a tree-like structure as a network of so-called Basic Action Concepts (BACs) - in long-term memory. BACs correspond to functional and biomechanical demands in concert with the situational goals and constraints of motion. BAC's are integrated mentally in a different way per individual. The degree of Integration of BACs is detected via Structural Dimensional Analysis-Motoric (SDA-M). In this study SDA-M is applied to the underwater sequence of the upper limbs of two butterfly swimmers. The purpose is to give inside how a) this method can be applied in swimming, b) how the individual basis for action control in skilled voluntary motion is detected by dendrograms and c) it can be used for better communication.
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