How to train body muscles to be a better runner, jumper and lifter.

WHY ARE BODY MUSCLES REALLY INTENDED?
There are two school sections on how to train body muscles. Some say that the muscles of the body are designed to move them around the spine (such as dancing). These are then those who make the old-fashioned ascension. Another school is those who say that the body muscles need to keep the body in place (especially the spine). These are the ones who make different forms.
WHAT BUT IS RIGHT THEN? Probably both!
We arWe hope that you should be able to move your body as far as it will go (for example, by changing the light bulb under the sauna stage). But when we talk about gym training, running, jumping, etc., it is necessary that the body does not "log", which in some cases can even cause lower back problems. 🙁.
It's clear that regular sit-ups won't help you squat better. But if you can keep your body stable, it's definitely easier to lift and throw different things. But what about golf or MMA, for example? There is a need to direct the force by rotating around the spine…? In fact, the fact is that it is much better if the body is "locked" and we can direct our forces through our hips and shoulders. Which school do you represent?
Videos of a small selection of workouts that could be constantly done to keep the body stabilizing the muscles in tone.