Getting fit again with expanders

Hi everyone. This is my first posting. I have had bilateral mastectomies and currently have expanders in place and am awaiting a date for swap over to implants. After 6 months of chemo, hand and foot syndrome, surgery four times, anaemia and all the rest I am pretty run down. I was very fit before my diagnosis in January 2013 and want to get back to that level. Just wondering how others who have had breast reconstruction are going as far as regaining their previous level of fitness.