According to the second law of thermodynamics, entropy of a closed system always increases. In short, wasted energy in the form of heat will be created in an energy system. The first implication is that energy must be inputted into any system that works on energy (i.e. no perpetual system that has 100% efficiency).
In Taoist meditation, the practitioner remains stationary, no physical work done can be perceived by the observer. Question: where does the driving energy come from?
Even when a person remains stationary, he has to breath. And the energy generated by his breathing muscles, if can be used efficiently, can act as the initial driving energy of the system.
The next question is How to conserve the energy arising from the breathing muscles. It can only be achieved through a highly focused mind and a relaxed body, in short, in the zone. Thus in normal situation, most of our breathing energy will be dissipated as heat, in meditative state the energy will be recycled back to the body for proper use.
In addition, this initial energy can, with proper advancement in practice, further liberate stored energy within the body. It is most amazing here, because this stored up energy consists of blockages along chi-channels as well as blockages around our major joints, in particular our shoulders' and pelvis' ball and socket joints. By using the initial energy to open these blockages, not only these blockages will be cleared for good benefits, the energy thus liberated can be further used to open more blockages and, for spirituality purpose, can be used to open a new area of psyche experience. Martial artists, on the hand, will use such energy to perform spectacular tasks. On pure psychological side, Taoist meditation can also release suppressed libido stored in a person's subconscious, a sublimation of one's suppressed sexual energy.
It is also interesting to note that the amount of wasted energy liberated during advanced meditative practice can be quite astonishing, as can be seen from experienced practitioners, usually Tibetan monks, of Tum-mo yoga, or the famous iceman Wim Hof, how they can withstand freezing temperature in open air for long period of time, and wet clothes wrapped around a practitioner can quickly be made dry through dissipated body heat.