For the roundhouse kick we block upward with both palms,
Notice the position of your own elbow; it is used to damage the
shin of the on-coming leg. Then we barge in with both arms pounding
down onto his body.
You should experiment with these techniques to find out which one
suits you the best. The whole idea of blocking is based solely upon your
being aware and this only comes with countless hours of controlled
practice. The moment your attacker has even thought of the attack you
barge in and re-attack, this is how we train to defend against kicks. The
arms do nothing special they just throw out in a circular block, and then
because we used a circular block we are able to bring it back to attack.
This is what is meant by balanced Yin and Yang techniques.
You must remember that no technique is perfect and some time in your
martial arts training you will be hit, this is the best experience that you
can have, you are then at least ready for it when it happens again, and it
will. For this purpose we use boxing gloves and protective equipment in
sparring.