Read through this list of eight ways to safely prevent boob sag.
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1. Keeping your pectoral (chest) muscles strong can help.
Bench presses with dumbbells or barbell weights will work well if done a few times a week. Having a strong layer of muscle in your chest will generally keep the skin firm on your chest, giving your boobs a boost.
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2. Avoid sudden weight loss, which can cause loose skin.
Obviously weight loss is an important and healthy thing, but when it comes to your breasts, this extra skin can cause some drooping and sinking. Try to gradually lose weight instead so your skin can catch up to all of that weight loss.