Can I go swimming once chemo finished but having radiotherapy?

I swam all the way through chemo - had a port so no issue with PICC lines. Obviously there was some risk of picking up an infection, particularly in hot changing rooms. I negated this a bit by arriving and leaving in a dry robe so I didn’t have to hang around. I didn’t swim during the actual week of radiotherapy but started again immediately afterwards. I then had to take a short break when the burn and skin peeling came out a few weeks later. 

I agree with Jo. It’s more important to exercise for loads of reasons, not least halving your recurrence risk. I’d swim in a pool, but would avoid the sea as it’s so often filthy.