FORCE COMES FROM YOUR HIPS.
Force = Mass times Acceleration is the rule of Physics. This sounds simple, but biomechanically, it becomes complex.
Touching something with your body does not automatically transfer your whole mass into it. Think of a weightlifter isolating their muscles: when they do an exercise, they are only using the muscles in their chest, or legs, or biceps, and so on do execute an action. This is a small fraction of their total force.
As fighters, we want to do the opposite, and use our whole body as much as possible in every action. This effectively increases the “mass” aspect of the equation. Doing so correctly, while weighing in other factors such as balance, is the origin of technique.
The second factor is relaxing. This makes our energy flow together, increasing the mass recruited, and transfers it through the body faster, increasing the acceleration.
The hinge through which all this happens is your Hips, and secondarily, your shoulders. So, while training, focus significantly on relaxing, and visualize all techniques originating in your hip movement.
As if your limbs are all on strings attached to your hips.