Hi Marie
Just see what works for you and avoid anything the aggravates your symptoms. For me most things are find that don't involve bending over or lying down. Walking, running, cycling etc are all fine so long as I don't drink too much liquid immediately before or during. I sometimes do the local park run at 9am on a Saturday so just need to make sure I eat breakfast no later than 7:30.

When cycling it is sometimes a bit more difficult as longer rides require me to drink fluids. I tend to take along some gaviscon tablets as a backup just in case.

My docs tells me that I can do all sports - running, cycling, swimming and also muscle exercise - but i should not lift too heavy weights that i have a forced respiration.