Assertion: countermovement jump | /r/CapableOf | make preliminary downward movement
Facets:
value: by flexing at the knees
type: MANNER
Source sentences:
text: A countermovement jump is where the jumper starts from an upright standing position, makes a preliminary downward movement by flexing at the knees and hips, then immediately extends the knees and hips again to jump vertically up off the ground (Figure 1a).