"the doctor recommended regular exercise"
"he did some exercising"
"the physical exertion required by his work kept him fit"
"he warned against the use of narcotic drugs"
"skilled in the utilization of computers"
"practice makes perfect"
"you must work the examples at the end of each chapter in the textbook"
"academic exercises"
"exert one's power or influence"
"practice law"
"Some parents exercise their infants"
"My personal trainer works me hard"
"work one's muscles"
"this puzzle will exercise your mind"
"She works out in the gym every day"
"We drilled French verbs every day"
"Pianists practice scales"
We take exercise every morning.
Walking is a good exercise.