[header] How to avoid having sagging breasts as a young woman [title] Keep your body young and fit by exercising. [step] It will make you look and feel good by controlling your weight and giving you a trim waist to help emphasize the perkiness of your breasts. [substeps] Aerobic exercise like jogging, walking, or swimming will help keep your waist small. 
Try to do 150 minutes of moderate exercise or 75 minutes of vigorous exercise per week. Aerobic exercise will also release endorphins which will relax you, lift your mood, and make you feel better about yourself.