exercise

/ˈɛk.sə.saɪz/

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

The teacher told us that the next exercise is to write an essay.

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

I do crosswords for mental exercise.

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

The law guarantees us the free exercise of our rights.

The performance of an office, ceremony, or duty.

I assisted the ailing vicar in the exercise of his parish duties.

That which gives practice; a trial; a test.