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I've done that a few times.

Once during an error in squatting with a warm up weight.

Once trying to snatch two 36 pound kettlebells for the first time.

Once when i was carrying a heavy box...

Lots of lower back pain is caused by hunching forward all day in a computer chair. it causes the arch to round.

I don't know how stretching forward is going to fix that, because that's bending...

^ Yes.

And Iron Bridge, where you lay with your feet on one chair and your head on another chair. This only works your back in a straightened position, tho, and is hard for most people, but it's...

Have her stand up and tense her abs as hard as she can while tensing her butt as hard as she can for 10-15 seconds. If she doesn't know how to tense her butt, tell her to imagine pinching a quarter...