The human body typically operates in positions that are not very stable and we must constantly use our muscles to adjust our body position and counteract the tendency of our bodies to fall over. For t...The human body typically operates in positions that are not very stable and we must constantly use our muscles to adjust our body position and counteract the tendency of our bodies to fall over. For the most part balance is subconscious, but watching a toddler who has just learned to walk will provide an accentuated idea of how much actual work is required for humans to stay upright.