activity requiring physical effort, carried out to sustain or improve health and fitness

exercise improves your heart and lung power

loosening-up exercises

an activity carried out for a specific purpose

an exercise in public relations

the use or application of a faculty, right, or process

the exercise of authority

use or apply (a faculty, right, or process)

control is exercised by the Board

anyone receiving a suspect package should exercise extreme caution

engage in physical activity to sustain or improve health and fitness

she still exercised every day

occupy the thoughts of; worry or perplex

Macdougall was greatly exercised about the exchange rate