EXERCISING

To exert for the sake of training or improvement; to practice in order to develop.

Example: "To exercise troops or horses;  to exercise one's brain with a puzzle"

To perform physical activity for health or training.

Example: "I exercise at the gym every day."

To use (a right, an option, etc.); to put into practice.

Example: "She is going to exercise her right to vote."

(now often in passive) to occupy the attention and effort of; to task; to tax, especially in a painful or vexatious manner; harass; to vex; to worry or make anxious.

Example: "Exercised with pain"

To set in action; to cause to act, move, or make exertion; to give employment to.