1. A method comprising, by one or more computing devices: receiving, from one or more sensors comprising a point-of-view camera positioned on a first user, first biomechanical data of the first user performing a first plurality of actions of a first action-type and first outcome data comprising a first plurality of outcomes of the first user, wherein each action of the first plurality of actions is associated with a respective outcome of the first plurality of outcomes; determining, based on the received first biomechanical data, a first plurality of sets of action-parameter values for respective action parameters of a plurality of action parameters, each of the first plurality of sets of action-parameter values corresponding to an action of the first plurality of actions, the first plurality of sets of action-parameter values being associated with respective outcomes of the first plurality of outcomes; ranking the plurality of action parameters for the first user, wherein rankings are determined based on a first analysis of the first plurality of sets of action-parameter values and of the respective outcomes of the first plurality of outcomes; assigning weights to the plurality of action parameters based on the rankings; and generating a first athletic-performance model of the first user based on the first plurality of sets of action-parameter values, on the assigned weights of the plurality of action parameters, and on the first outcome data, wherein the first athletic-performance model comprises target ranges of action-parameter values computed for the first user based on a second analysis of the first plurality of sets of action-parameter values, of the assigned weights of the plurality of action parameters, and of the first outcome data.