It makes sense, doesn't it? When you exercise, your blood circulates much better. Exercising increases your own natural growth hormone. These are facts. There are people out there that are in their 50s and have bodys of a 30 year old. A good exercise routine and good nutriction certainly would help your body use the estrogen more efficiently.
When I work out or I've had an active day at work, It feels like or seems like my boobs are swelling and tender.

When working out, one just has to be careful doing certain chest exercises, you can work off some of what you gained.