The topic of sitting being the new smoking is getting notice all over. Desk workers are asking for stand up desks to decrease back injuries. It is true that sitting in a chair brought on a new level injuries. Sitting in a chair is very unnatural for humans. Our bodies are built for movement and function, not sitting for 3 to 6 hours in a chair. When those movements and functions are not performed, our bodies will erase the muscular knowledge of being able to perform movement or posture. In other works our bodies become stiff and tight. Most people just contribute the inability to age. Well its not age, it's that we don't get into those postures any longer (there are cultures who still perform these)
This position is known as a toe sit. Dr. Craig Liebenson, and Anna Hartmans article Rest, Resilience, and Retuning the Body, describes 4 postures that humans did for millions of years as a resting position.
Decreased big toe mobility will affect hip, sacroiliac joints and low backs. The following is a chain reaction to decreased toe mobility, The arch of the foot can not be fully loaded (less support and power), the ankle will decrease its range of motion, the hip can not fully extend, decreasing glute activation and hip mobility, lack of hip mobility increases stress on the low back. The chain can continue all the way up, or pass over to the other side of the body. Practice these rest positions in short periods often, and you will notice increased mobility during activity, less pain, stiffness and tightness, and increased resilience.