A few points I always try to keep in mind:
- Hand out, elbow in.
- Don’t move the hand.
- Don’t displace/bend/extend the knee, but the energy rotates around the knee.
- The spine is like an axis, which can’t move/toss. The trunk rotates on it. It should be (always?) perpendicular to the floor.
- Head hung from a string.
- All movements start from the foot.
- Body joints are like gears linked together – if your hand seems to move from one location to another, it is pushed or pulled by another part of the body, I think it’s the foot.