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Aerobics classes are a specialised form of exercise aimed at strengthening the body's cardiovascular system without overly stressing any particular part of the body. It involves a lot of bodily movement , but the movement is designed to be not overly repetitive

This helps to condition your heart and lungs by increasing the oxygen intake which alows the heart to use oxygen more efficently. Additional effects include, increased energy levels, toned and leaner muscle mass, decreased tension, better sleeping, improved stamina and reduction in depression

Women in particular, like it because aerobics classes burn calories and doesn't lead to grotesque musculature.