exercise, exorcise

Exercise or exercise ( pronounced Ex-er-size ) means physical activity or a workout--
We really need to get more exercise.
The exercise will be good for them.
Exercise may also mean to make use of a right or faculty--
Be sure to exercise your right to vote in the November election.
Exercise your own judgment.
Exercise may also mean an operation or drill--
This will be a training exercise.
It was an exercise in futility.

Exorcise or exorcise ( pronounced Ex-or-size ) means to cast out demons or evil spirits through prayer or a religious ritual--
In olden days, people called on a priest or shaman to exorcise evil spirits.
Today only a few churches still exorcise people afflicted with mental disturbances.

Now that you know that, you can say--
"She thought about calling a priest to exorcise the child, but he probably just needed to get some exercise."