Can Working out my Chest Reduce my Breast Size?

As mentioned by prior posters, the answer is YES if you lose weight and body fat in this process.  Simply working out itself to strengthen and tone your muscles will not change your breast size but weight fluctuations will affect your breast size if the weight change is significant.  Your body will never regret working out so go for it!

Working out itself should not change your breast size, unless your workouts are such that you change your overall body fat composition.

If your fat content goes from 30% to 15%, you would, by definition, lose fat from your body. From where it comes is defined by your individual genetics. Some undoubtedly would come from the breasts. Most younger women have relatively less fat and more breast tissue in the breast, so they are more immune to changes in size.

Working out any particular muscle group will not preferentially cause loss of fat in that particular area. If you are genetically predisposed to lose fat from the breast, it won't matter if the exercise is in the chest or the legs.

Thanks for the question, best wishes. 

Thank you for the question.

 Chest exercises in and of themselves will not necessarily reduce breast size. However, losing body fat/weight may result in breast size changes. The degree of change will depend on how much weight is lost and other considerations such as quality of skin elasticity, genetics…

I hope this helps.