reaction forces made as the support foot contacts the ground
have been reported as 15-20 N (1.5-2 kg vertical force),
4-6 N (posterior, braking) and 5-6 N ( lateral, towards
the non-kicking side). This suggests a stabilising
of the body and a tensioning of the leading support leg,
allowing greater muscular forces to be exerted by the muscles
responsible for the kick force.