Exercise and Eating Relationship
The following illustrations (from Tim Smith, 1988, Youth Strength Training, Athletic Institute: North Palm Beach, FL) will help you to better understand the relationship between eating (calorie intake) and exercise (calorie output) relative to weight control (maintenance, gain or loss).
Weight Maintenance:
Weight is maintained when there are equal calorie intake and expenditure.

Weight Gain:
Weight gain occurs when more calories are ingested than are expended.

Weight Loss:
Weight loss occurs when more calories are expended than ingested.

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