From Paige Waehner,
Your Guide to Exercise.
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Definition: The ability of your body's muscle to generate force in a short period of time. This type of activity relies on anaerobic energy--allowing you the short burst of energy you need to lift a heavy weight. When you increase your strength, you're often also increasing the size of your muscles as well as strengthening your connective tissues. This can help avoid injuries and, of course, make you stronger and healthier.