Build up Internal Force

Learn the secrets of building internal energy within your body and harness that power.

Steps

Understand the three principles of internal energy:, regulating the posture (body), regulating the breath, and regulating the mind.
Learn Chi Kung, Yoga or Ilmu Tenaga Dalam (Ilmu Tenaga Dalam can be found in Malaysia and Indonesia).
Learn abdominal breathing. If you are not at a teacher level, don't try to modify the techniques.
Learn to relax your body.
Learn to relax your mind. Your mind should be attentive or in the state of awareness.
For beginners, learn this simple technique: Sit down on the floor; relax your body; breathe naturally; don't think of anything, just be attentive.
Another technique is to count your breathing to ten; after you have counted to ten, repeat the process of counting from one to ten. Do it for one minute or a few minutes.
If you feel the energy moving inside your body, don't try to control it. Let it flow naturally.

Remember: Just because it is simple does not mean it's not effective. Although you learn a simple technique, the effect is profound. You may feel more calm.
The feeling of internal energy and explosive force comes from your many muscle groups engaging in unison in a single act like a punch. By building internal energy, you facilitate the action.
Best part is relax yourself if you are over done.
learn tai chi exercise and breathing exercise.

Joints if not trained are susceptible to injury if overworked.
Don't modify the technique if you are a beginner.
Mystical "energy" flows cannot be shown to exist. If you wish to be fit, or physically strong and agile, or to perform martial arts effectively, consider practicing these things instead.