Interesting! I would think keeping torso upright while walking would be engaging more muscles compared to standing, but I never studied this in detail, so you m

Interesting! I would think keeping torso upright while walking would be engaging more muscles compared to standing, but I never studied this in detail, so you might be right. But then it's interesting that I sometimes have sore back after a run if I don't run for a long time while I haven't experienced this when standing yet. Maybe my running form is poor.