Do you need to hold your breath for left breast radiation? Read this ...

Hi I had my radiotherapy at the Genesis Centre in Darlinghurst on my left breast in November last year and did the DIBH.
My understanding was it was to minimise any damage to the heart.
I have done a lot of  snorkelling  so didn’t find the technique difficult but I could see it might be an issue for some.
I closed my eyes and imagined myself snorkelling at Ningaloo Reef in WA ( not likely to be anytime soon!) and my 28 sessions just flew by!