This physiological change is an example of Acclimation.
Step-by-step explanation:
Acclimation is the change someone undergoes mentally or physically to adapt to the new environment or changes. It occurs in very short period of time. And also when someone practices one new task regularly, it becomes easy to do due to regular practice.
In the beginning she used to get tired very early because she only had started. But as the time passes and she keeps his jogging on her capacity to jog increased gradually. With the time her body gets habitual according to her schedule and her jogging and now she can easily jog for four miles. This show that human body can set itself with the time according to the requirements and can also increase their capacity to do the task gradually. Thus how this is an example of Acclimation.