The mechanics of a power kick_using soccer as an example_ Final
ball velocity depends upon several factors. There are, however,
three primary determinants in ball velocity: If the hip of the
kicking leg is not fully extended prior to foot plant,
subsequent leg swing velocity will be reduced. This extension
("cocking") of the hip (1) allows greater distance for the leg
to increase its velocity on the forward swing, (2) stretches the
muscles which cross the hip to facilitate their contraction and
recoil of the leg, and (3) permits greater rotation of the hip.
If the supporting leg flexes excessively during foot plant, the
velocity of the kicking leg will be reduced. On the other hand,
a firm supporting leg "blocks" the forward motion of its hip and
increases the velocity of the swing leg. Improper coordination
and sequencing of movements in the kick will reduce possible
ball velocity. The order of events in the kicking leg, following
hip extension, are: (1) hip rotation, (2) forward swing of the
thigh, and (3)