At 3,500 calories per pound, 14 pounds equals 49,000 calories. Losing 14 pounds in two months will require that you combine diet and exercise to take in and/or burn calories in a way that creates a 49,000 calorie deficit over that period.
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Lifting dumbbells can reduce the risk of sports-related injuries and help muscles work more efficiently. Teens should focus on lifting to build strength and tone rather than to build big biceps. Lifting weights that are too heavy can cause damage to the tendons and ligaments of still developing bodies.
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