My teacher often said that a Chisao master = Wing chun master

So what is a chisao master?
First of all, it's someone who can deal with anyone and still control their own temper. 
If you cannot control yourself, you cannot control anyone else. In chisao you learn to control your own actions in a way that gives you a way to deflect your opponent's defenses rather than forcing your way through.
This way enables a somewhat smaller person to defeat a bigger opponent.
Be humble, stop fighting and start just reacting and you'll improve so much faster.

So what is chisao then?
 Chisao is a drill that teaches you to defend and attack at the same time. It teaches you to avoid using power against power by using contact reflexes and it teaches you to chain your attacks to tear down your opponents defenses.

By learning how to use both hands together your handspeed will become incredibly fast.

Using drilled contact reflexes mean that you will further increase your speed because you don't have to "choose" a technique. Your body has already been programmed to react in the most efficient way.

Chained techniques increase your fighting power beyond your size by constantly keeping your opponent on the defense and defeating him without leaving him any chance to get back into the fight before it's over.

今回の詠春拳動画の内容：　　English below:

コンセプト：前へのプレッシャー
コンセプト：センターラインを攻撃

相手のセンターラインをコントロールしていないと、反撃される可能性が上がります。
攻撃が相手を通すようにパンチしましょう。できれば、相手のバランスを崩すや相手が後ろにステップするように攻撃します。
そのため、強い攻撃プレッシャーが必要です。

プレッシャーをかけるのと押すのは違います
攻撃でプレッシャーをかけます。相手が後ろに下がったり防御をしたりしないと攻撃が当たるというプレッシャーをかけましょう。
押すのはただ押すだけです。ダメージはときにないです。

ほかに動画の中に出るコツ

• 相手のセンターをまっすぐ攻撃すること　ー　斜めに攻撃しないで
• 打ち合いにならないように
• 攻撃をコンパクトにしましょう　ー　無理しないで
• 背が高い相手の場合、近い距離で下から攻撃
• 引っ張らないで
• 引っ張られたら、抵抗しないで
• 引っ張られた方向に行きましょう
• 出来れば、相手の引っ張る力を利用しましょう
• 押さないで、流す　（押し技を使う場合もあるけど）
• 押すのに力いっぱい使うなら、パンチに使う力が思い切り減ります

Concept: Forward pressure
Concept: Attack the centerline

If you don't control the opponent's centerline it's easier for him to counter you.
Attack "through" your opponent and break his balance or make him step back.
For that, you need strong forward pressure.

Pressure and pushing are not the same
Pressure is applied using attacks inflicting or threatening to inflict damage forcing the opponent back in order to avoid the attacks.
Pushing is just pushing, no real damage is being done.

Other tips and pointers in the video:
Attack straight towards the opponent's center
Don't attack diagonally
Avoid exchanging punches
Make your attacks compact, don't overreach
Attack from below when dealing with a tall opponent
Don't pull
f pulled, don't resist.
Go with the pulling energy
If you can, use the opponent's pulling power to your advantage
Don't push, deflect
​If you spend a lot of energy on pushing there's very little power left for punching

チサオ練習する時、初心者がやりやすいミスを動画で紹介します。 正しいやり方だけではなく、もっとミスのこと知っていると役に立つと思います。
​思い切り初心者レベルだから少しでもチサオできる人だと違う動画を見てください。