To use my own example, I'd say an important starting point is learning to connect one's body - HOW you do it may depend on your style and or desirable end result (wielding weapons, holding postures, etc.) but the general theme is that the body is connected together (bones, skin, muscles, tendons, ligaments) in such a way that when one part moves, all parts move (that movement may be big and visible or hidden). Certain postures, breathing, movements and light pressure practices can aid in learning to connect one's body (which is why many styles have practices that are common, with understandable twists [hehe pun], across systems - while also having their own proprietary methods).
Putting power in the middle - if your body is connected in the way I start to describe, you can then draw upon more of the body's whole power to achieve things that seem either really strong, unusually strong, explosively strong, etc (depending on ability, conditioning, skill, etc.) and you can access that strength from seemingly strange positions, partly because you generate and source that strength (legs, middle, back) in a way that might seem counterintuitive e.g. move the middle down the leg to move the hand (it's CONNECTED you see??), but wait, you said HAND!! Darn, I meant . . yeah, language can sometimes get difficult, even when we're both speaking English.