There are three sub sections viz. There's no short cut for conditioning. A conditioned body with a strong heart and open lungs, reaches that stage through aerobic exercise running, jogging . A conditioned heart beats easily during normal activity, but respond quickly to increased demand. Fit lungs deliver a greater amount of oxygen to the blood.
Fit cells can assimilate food faster.
To act your body in this shape, you need to exert it for a sustained period. A conditioned mind grows fit by regular exertion. One must put oneself in the position where one need to concentrate for a sustained time. One must persist. One must guide one's mind to go where one want it to go.