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Definition of fitness noun from the Oxford Advanced American Dictionary

     

    fitness

     noun
    noun
    NAmE//ˈfɪtnəs//
     
    [uncountable]
     
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  1. 1the state of being physically healthy and strong a magazine on health and fitness a fitness instructor/class a high level of physical fitness Topic CollocationsDiet and Exerciseweight
    • put on/gain/lose weight/a few pounds
    • watch/control/struggle with your weight
    • be/become seriously overweight/underweight
    • be/become clinically/morbidly obese
    • achieve/facilitate/promote/stimulate weight loss
    • slim down to 160 pounds
    • combat/prevent/tackle/treat obesity
    • develop/have/suffer from/struggle with/recover from anorexia/bulimia/an eating disorder
    • be on/go on/follow a crash/strict diet
    • have/suffer from a negative/distorted body image
    • have/develop a positive/healthy/realistic body image
    healthy eating
    • eat a balanced diet/healthily/well
    • get/provide/receive adequate/proper nutrition
    • contain/get/provide essential nutrients/vitamins/minerals
    • be high/low in calories/fat/fiber/protein/vitamin D/Omega-3 fatty acids/trans-fats
    • contain (no)/use/be full of/be free from additives/chemical preservatives/artificial sweeteners/high-fructose corn syrup
    • avoid/cut down on/cut out alcohol/caffeine/fatty foods
    • stop/quit smoking
    exercise
    • get regular exercise
    • do moderate/strenuous/vigorous exercise
    • play football/hockey/tennis/soccer
    • go jogging/running
    • go to/visit/hit/work out at the gym
    • strengthen/tone/train your stomach muscles
    • contract/relax/stretch/use/work your lower-body muscles
    • build (up)/gain muscle
    • improve/increase your stamina/energy levels/physical fitness
    • burn/consume/expend calories
    staying healthy
    • be/get/keep/stay healthy/in shape
    • lower your cholesterol/blood pressure
    • boost/stimulate/strengthen your immune system
    • prevent/reduce the risk of heart disease/high blood pressure/diabetes/osteoporosis
    • reduce/relieve/manage/combat stress
    • enhance/promote relaxation/physical and mental well-being
  2. 2the state of being suitable or good enough for something fitness for something He convinced us of his fitness for the task. fitness to do something There were doubts about her fitness to hold office.
See fitness in the Oxford Advanced Learner's Dictionary