The difference between Chi, Ki, + Jing

[Kyokushinka]

Please, can someone explain this to me?

I think in was kakkarot who mentioned something along the lines that relaxation or muscles helps chi, and the flexing or tensing of muscles helps ki manipulation???

Meanwhile I've barely got a clue about what jing truly is, as not many people agree on it. And how does one use it?

-Mera