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15 minutes of stretching is recommended as a warm-up to more intense physical activity to bring up one's breathing and heart rate, blood circulation, and muscular metabolism before a workout session. They also improve the elasticity of muscles and tendons and protect your joints. Stretching should also be done at the end of a workout as a cooldown, to avoid muscle cramps, and to promote proper recuperation and regeneration of the muscles in preparation for your next workout.
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