Long Term Pectoral Muscle Use After Breast Reconstruction?

      Once the implants have been placed and healing has been completed, there are very few limitations.  There are some bodybuilders and weightlifters who are so strong that the implants can become displaced over time with such powerful contractions.  However, this does not apply to the majority of patients.  Kenneth Hughes, MD Los Angeles, CA

There is a little bit of truth in both statements: you should be able to participate in all sports without limitation, but weight training for the pecs can create some issues. If they get too strong, they can cause what are called animation deformities. So I generally don't encourage upper body weight training with implant reconstruction.

Once fully healed, you should have no restrictions. I ask my patients to avoid strenuous physical activity for the 6 weeks after surgery while they recover.

You now have a tissue expander and are going through the expansion process.  At this time I would be careful and not over-exert myself, but after you have healed from the implant exchange procedure, you should be able to go back to as normal of a life as possible

I have not found such limitations to be the case. While I do not know if there has been tissue damage from radiation that is resulting in such a recommendation, I have plenty of patients with implant-based reconstruction who are avid mountain bikers, wake boarders, and even body builders who have not had lateral displacement. Movement or compression of the implant is a common observation during vigorous pectoralis use but should resolve with completion of the muscle contraction. 

I have never heard that you can not work out once things have healed.   You  may want to get a second opinion.