Newport Beach Plastic Surgeon Q & A

Replacing your implant with a smaller one in the same pocket should be fine if using a gel implant.  If you are thin with little breast tissue, you will want to avoid a saline implant in the subglandular position to avoid rippling.  With regards to capsular contracture, you should be fine keeping your implants in the same pocket if you currently have soft breasts.

Realize, however, that anyone with silicone implants can at some point develop a capsular contracture.  There is evidence to show that the submuscular position has a decreased incidence of capsular contracture but this may not be your best option at this point and given that you are a personal trainer.