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It's no secret that cardiovascular exercise is essential to health. It helps with weight control, keeps the heart and lungs in working order, and boosts your mood. But high-impact exercise isn't appropriate for everyone. Beginning exercisers, or people with bad knees or back issues, shouldn't be pounding their joints into the ground. Don't let the term "low-impact" fool you. Exercises that don't involve jumping—or other high-impact moves—can still be rigorous. But to be effective, you need to work out 150 to 300 minutes a week, says the Centers for Disease Control and Prevention.