@Claudia79
not sure what State you are from so here is a link with some ideas of where there are some structured programs for exercise
https://www.bcna.org.au/health-wellbeing/physical-wellbeing/exercise-and-staying-fit/exercise-programs/Also in my kit from the breast care nurse was a DVD from BCNA called "Strengthen Your Recovery" a pilates programe following breast cancer surgery - it is mentioned in this link here
https://www.bcna.org.au/understanding-breast-cancer/treatment/surgery/staying-mobile-after-surgery/Take care