Take a knife and start walking. hold it in different positions while keeping yourself comfortable and relaxed and see how you can work with the knife using just the body movement. Repeat the drill while sitting on your behind and moving about and also prone on the ground taking care to keep breathing and relaxing the eyes from focusing on objects and rotating yourself around a perceived interest.
Now start walking and as you walk move the knife at the end of your arm constantly and as you walk move the knife through the path you just covered so if someone is coming at you he or she will always be coming at the edge and not at you. Remember to move from the sides and back and not just following both eyes and see how you can relax and keep breathing and moving all at once.
Add a partner coming at you with a blade or something else and repeat the drill leaving something either behind where you just were to hit or stab or slash or lever and so on or walking/rolling/ moving out of the way and moving the blade or something else through the path minding not to get caught or tense and don’t forget to stop short the partner from time to time using a hit to his moving tension and keep breathing.