Cases of word usage

1) a method of physical exercise with music (aerobics)

2) something done regularly; regular and frequent repetition or exercise to improve ability (practice)

3) a method or system of government or administration; a set of rules for diet, exercise etc for improving one's health and physical well-being (regime)

4) (of a person, part of the body) not fat; attractively thin; almost not enough; to eat less, take exercise etc in order to become slim (slim)

5) (a kind of) activity, especially outdoors, done for amusement and exercise (sport)