I had a single mx in September with immediate mesh and silicone implant reconstruction. Unfortunately it got infected and removed in December. After chemo I had an expander put in 4 weeks ago. It's part silicon/ part saline, the surgeon half filled it at the time of the op. I had it fully expanded yesterday with another 150ml of saline because rads planning is Monday so we didn't have time for a slow expansion. It feels fine, I slept happily on my front last night and have full range of movement.
I went back to yoga 5 times a week just 3 weeks after mx and carried on throughout chemo. Since chemo I've also been swimming and doing combat / gym training. I'm sure all this has helped the flexibility - physio is impressed! So keep going with the exercises ladies.