What is the meaning of Exercise?

Any activity designed to develop or hone a skill or ability.

Activity intended to improve physical, or sometimes mental, strength and fitness.

Such activity of physical nature, for physical fitness (plus also mental benefit).

Such activity of mental nature, for neurocognitive health.

A setting in action or practicing; employment in the proper mode of activity; exertion; application; use.

The performance of an office, ceremony, or duty.

That which gives practice; a trial; a test.

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

To perform physical activity for health or training.

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

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.

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

Source: wiktionary.org