This is a great video from Naudi Aguilar at functional Patterns, highlighting how the way we breathe can affect things like hamstring flexibility. Hamstring flexibility can be a major factor in some back pain issues. This is a good example of how small changes can make a big difference to how our body functions. Also the more we invest in looking after our body the better it will function whether you intend to run marathons or just go about your day to day life.