Want to INSTANTLY improve your offense and defense? Always keep your Eyes On Opponent. When on defense, don't cower so far behind your guard that you can't see where the punches are coming from. Look out from behind your guard and stare down your opponent. Pick off those punches and throw a counter when you see a hole in your opponent's defense.
When on offense, you should definitely keep your Eyes On Opponent because it ensures that you are committed to the punch. You are being confident, the punch will strike with more impact, and you may notice even more punching opportunities.
Remember: Eyes On Opponent!