Hey Sal,
Part of the reason they currently feel so hard is that they've been placed under your pectoralis muscle - a really strong muscle that is fighting against being stretched! The implants are placed under the muscle because it helps ward off infection, rejection, protects your skin etc. This will definitely give over time (usually why others get expanders put in and then change across to implants later on).
@primek recently changed over to the implants, so I'm sure she will give you some great advice.
Meantime, good on you for doing the exercises and getting moving - this will help you over the long haul.
Good to hear from you!
Nikki
