Good defensive posture (in no order)

1. Head canted slightly and angled slightly. Head straight up and even between shoulders is bad news.
2. Weight mostly on back foot keeping head far from foes punches. On both toes so able to move in any direction. Left shoulder should be slightly higher than right (orthodox)
3. Hands held high, left protecting chin.
4. Feet roughly shoulder width apart

Oh hell watch Floyd Mayweather, James Toney or BHOP on this one.