Hi @Maree72
All the literature says exercise during and after treatment is good for your mental and physical well being and can assist with side effects.
it sounds like you are likely to have a lumpectomy rather than a mastectomy - the latter is a much bigger operation - but assuming it is a lumpectomy you should be able start walking for a cercus’s very soon after the operation.
They should also give you some gentle exercises in the hospital - but there will be limits on what you can do for a few weeks, Your medical team
can advise.You need to tsk evict easy and give everything time to heal .
I would be concerned with getting the wound wet in a pool - that could be a recipe for infection.
I did see a physiotherapist who specialized in breast cancer patients after my mastectomy and it was very helpful - but as I said that’s a bigger surgery than a lumpectomy.
I live near the ocean and still do swimming in the ocean which is great exercise ( and therapy).
Take care.