The biggest trick is knowing how to coordinate as much of your body as possible.
You want every muscle group in your body aiding in the final impulse before you make contact.
Your peak force happens in different time frames depending on the body part.
You need to know which muscle parts start when.
It's like trying to get multiple people to hit the same point at the exact same time, while having very different arm and leg lengths, reaction times and body weights.
Your muscles produce force on a curve, you need multiple curves of different length peaking at the same point in time and space.
But anyways genetics gives an amazing advantage in this.
I could be wrong, but you got this thing called motor neurons or some shit in your arms.
Anyways they are like on switches for your muscles, kinda like taste buds. The more motor neurons per muscle the more degrees of usage you have(better coordination)
Anyhow the ratio of motor neurons can in the end define how well your bicep tricep, forearm, abs, delts, etc can work together.