Let us start at the left branch of the model in Figure 2.12 and work to the right. We have already identified fast run-up speed as a critical feature (CF1) for this event.
We have already noted that maximising the mean force and the acceleration path are desirable to maximise take-off speed (but see below), so we now need only to translate these terms into things we can observe. The mean forces are maximised by the jumper maximising force generation (Figure 2.13). This can be done in three ways: directly, by a fast and full extension of the take-off leg (CF2) increasing the force on the take-off
board and, indirectly, by a fast, high and coordinated swing of the free leg (CF3) and the two arms (CF4). If the indirect contributions are not clear, refer to Figures 1.21 and 1.22 (pages 24–5), in which the normal and model swings of the arms in the standing vertical jump both increased jump height