Am 3 weeks post op and I have exactly the same feeling too, it’s a strange sensation. I saw mr Singh about it last week and he said it was completely normal, part of the healing process so your body produces fluid to fill the space whilst your vessels are reknitting, plus you still have a element of swelling along with the implant being accepted and moving into the pocket. It’s still early days, like you am desperate to return back to my training regime, am going loopy but I know if I try before I have healed it may give me a bigger set back. hoping I can’t start walking on the machine on a incline and the stepper machine but am thinking I may just go the full 6 weeks, are you still feeling tender at all ?