fitness – n. the act of being healthy through exercise

client – n. a person who pays a professional person or organization for services

calorie – n. a unit of heat used to indicate the amount of energy that foods will produce in the human body

obesity – n. very fat

lifestyle – n. a particular way of living

illness – n. a specific condition that prevents your body or mind from working normally

jump on the bandwagon – expression. to join an activity that has become very popular so you can share in its success