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To lose weight, the American Council on Exercise recommends doing a combination routine of aerobics, strength training and flexibility for at least 45 minutes per day on five or six days per week.
To maintain your weight: Work your way up to 150 minutes of moderate-intensity aerobic activity, 75 minutes of vigorous-intensity aerobic activity, or an equivalent mix of the two each week. Strong scientific evidence shows that physical activity can help you maintain your weight over time.