Just like any other space-binding creature on this planet, humans have a body to move around. 206 bones float in a network of tendons, ligaments, muscles and connective tissue. The position of the bones determines your body shape, the tension network around it provide its integrity.
Tensegrity governs the permanent shape-shifting of the body. Each joint attaches to multiple tension elements. Antagonistic muscle groups allow for back and forward movement along hinge joints. Ball and sockets joints like hips and shoulders can come apart without activated muscles holding it in place.
Your tonic muscles maintain your body shape most of the time. These muscles use oxygen directly, and can sustain activation for a long time. If you would use only these muscles to stand, you could do so effortlessly for hours. As an experiment, just stand with your feet a shoulder-width apart and ask yourself gently whether you can do it easier. Observe what happens.
Just standing or sitting turns into an opportunity to discover your unique attitude to the world. Slow movement serves the same purpose. When done properly, mainly the tonic muscles facilitate the movement.
Most of the ‘large’ movements involve phasic muscles, which act faster and stronger than red muscles tissue. With impressive names like biceps, latissimus or gluteus and easy visibility this group seems more popular than the core. You don’t need to know the names of core muscles to give them a workout, learn to deactivate the large, phasic muscles and the tonic muscles take over.
Technology has influenced human movement quite significantly over the last few centuries. Laziness has been known for longer, yet only privileged people could avoid even moderate physical activity. The modern world has made humanity quite sedentary, which numbed the bodily feedback most people can perceive.
If you understand the technology of your structural support system (tensegrity), you can regain graceful ways of moving, even if your gait currently resembles a zombie shuffle. As an experiment, have a walk and focus on the constellation of your bones.