Long jumpers make use of the conservation of angular momentum
when they jump. As jumpers leave the board they keep their bodies long in the hang style of
long jump in order to slow down forward rotation as shown in the diagram. An alternative
technique is the hitch kick where the jumper rotates their legs in the opposite direction to that
in which their body tends to rotate and this also reduces forward rotation of the
body.
The reverse is true of a diver or a trampolinist; they go into the tuck position to
speed up their rotation. In the same way spinning skaters will speed up their rate of rotation if
they bring their arms into a vertical position.