I do not fear the man who practices 1,000 kicks one time each. I fear the man who practices 1 kick 1,000 times.
If you don't want to slip up tomorrow, speak the truth today.
The more relaxed the muscles are, the more energy can flow through the body. Using muscular tensions to try to 'do' the punch or attempting to use brute force to knock someone over will only work to opposite effect.
A fight is not won by one punch or kick. Either learn to endure or hire a bodyguard.
Defeat is not defeat unless accepted as a reality-in your own mind.
Either you understand or you don't, and that is that.