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I don’t think it matters much as long as you aren’t pulling hard with your lower back and it taking over for your upper back. If the movement is slow and smooth, your upper back/arms should be the limiting factor and feel it.

That being said, I do prefer to keep my back as still as possible.

I’ll try to find it, but I thought I saw an organization that was trying to come up with a standard Linux flavor for vehicles. If not, it definitely needs to happen