Because typically the problem isn’t now it is a buildup.
If your back has already been overloaded via repetitive stress then a small thing could be the straw that broke the camels back. It just manifests at a certain time. Basically I threw my back out once in a very nasty way. The reason was one muscle was so overstressed it got careless and tired. During a motion the muscle over pulled and literally moved my spine slightly out of place. Took me a month to be able to sit straight.
It isn’t that my motion was bad, but the system was mid breakage if that makes sense.
Meanwhile when doing big motions intentionally you brace yourself. Though I know someone who did and still overworked his muscle so bad he ripped his entire shoulder off. Lost the use of half his upper body. That was because he ignored the I’m overworking signal because he was transporting a patient and refused to let him get hurt. Ems workers are heroes.
Also to add, other replies are also accurate. There is more than one reason.
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