The javelin thrower and their implement can be considered as a system moving in space and time, with a proper synergy between the two resulting in the maximum distance thrown. The javelin thrower themself can also be considered as a system - a system which is made of a number of body parts having their own mass and their own mass distribution, with the neuromuscular system being in charge of controlling the interaction of those individual parts. From a dynamic point of view, the final product of that interaction is the result of another interaction between muscular forces and external forces - the latter being the inertia of the implement and the body parts and also the force of gravity. General knowledge about movement interaction and coordination is essential for maximizing the positive mechanic effect on the throw.
Techniques for Track and Field & Cross Country
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Maheras, A. (2019). Selected Segment Dynamics in Javelin Throwing, Techniques for Track and Field & Cross Country, 12 (4), 38-48.