To develop power on both fists, training on a heavy bag is very essential.

In skillful fighting, don’t rely on just one technique. You need to have different combinations to confuse your opponent. Pacquiao isn’t just known for his power but with his rapid punching, adaptability, and unpredictable combination of blows uncommon to other fighters.
Striking the mid-section of the body is very effective and can cause excruciating pain. This is the easiest way to knockout someone, even bigger guys. An advisable technique especially for little guys like Pacquiao.
The secret in generating the power is the combination of the impetus, leverage of the body, and the lightning quickness of the fists upon throwing. These are the attributes you cannot see in other fighters.
Try doing Press-ups, AKA Push-ups, Sit-up for stamina n energy.Skiping for 10 minutes (equivalent to 30 minutes of jugging)
.Lifting weights is not good, it will only grow your muscle, not make it powerful. A person who doesnt lift weights and only does push-ups, sit-ups, etc. has more power than a person who lifts weights. I recommend you dont lift weights, so that your muscle will support your speed and control your punch.

Shrugs can also help. A shrug is when you hold two heavy objects in both of your hands and keep your hands hanging whilst lifting your shoulders up - NOT your arms. That is different from lifting weights. *note that the weight you are using should be less than half you weigh and also more than a 1/3 of how much you weigh.
A speed bag does not improve your hand speed,
Buy a dumbell weight that you know you can handle.
Drink plenty of liquids.
Make sure you are in a good mood.
Relax if you have to.
Dont expect to get faster in only one day, it takes time.
Have adult supervision when practicing underwater.
Stop when you want to, dont let anyone pressure into doing more.

What Taizendo means
[TAI] means body, [ZEN] means total, and [DO] means idea and method. Thus, the name of Taizendo represents Comprehensive physical method (Total Self-defense martial arts) as well as Implementation of idea by use of the whole body (peace activity via physical and mental control).

Purpose and policy of Taizendo
Taizendo is a method of not only self-defense but also self-control and good coexistence with others. Thus, you can say that the main purpose of Taizendo is, by way of popularization of its techniques, to learn how successfully people around the world can coexist and develop together as well as to establish networks which help to build globally peaceful environment.

Self-defense techniques
Lessons of Taizendo teach you how to protect yourself via unarmed one-to-one fight. Nevertheless, unlike traditional karate and judo, Taizendo techniques do not aim to determine the winner nor to beat up your opponent with your accumulated force. Taizendo is a skill to avoid fighting and promote reconciliation preferably without harming neither the opponent nor yourself.

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Shito-Ryu-Karate (Gorkha Community) Hong Kong