Very good point. I had lower back pain until I switched to being mostly barefoot or wearing barefoot shoes. After a few weeks of not heal striking, my back pain

Very good point. I had lower back pain until I switched to being mostly barefoot or wearing barefoot shoes. After a few weeks of not heal striking, my back pain disappeared. Sample size of one, so take that for what it's worth. It's not a stretch to think that adding new elements to a complex system that's developed over millions of years may introduce problems. Eliminate the new element, and you may eliminate the problem.