How to prevent gynecomastia thru exercise ?

Pseudogynecomastia: You can not prevent gynecomastia by exercise unless it is pseudogynecomastia which is male breast enlargement due to fatty tissue. True gynecomastia that has not regressed over a period of 1-2year, surgery like partial mastectomy with liposuction to treat it. http://www.talroudnerplasticsurgery.com/male/male-breast-reduction-gynecomastia-miami-fl/.

Exercise won't help: Do you mean prevent or treat gynecomastia? Exercise will help you lose body fat, including chest wall fat, but the breast tissue will not go away without surgery.

Can't: True gynecomastia cannot be prevented through exercise. However, if the breast enlargement is related to adipose tissue ( pseudogynecomastia), improvement may be seen with diet/exercise and achieving a long-term stable weight.