Answer:
because you are using them and it because it your bones get tired
A. and B., this is the life of most Bi Polar and Clinical depression
This act is an example of psychodynamic therapy for it will reveal the thoughts of the person in an unconscious state. These will tell things that he does not want to know by others or how he perceive things without stopping himself because it is involuntarily happening on its own. This also supports and helps alleviate psychic tension in which a person could experience.
Resistance training increases muscle strength by making your muscles work against a weight or force. Body composition.
