Hi,
I truly believe that exercise can really help with stress, anxiety and panic attacks. In fact the first thing that the psychologist I went to told me, was to go to the swimming pool 2 - 3 times a week. Infact I think there is an anxiety program in Australia that incorporates swimming and exercise.
I have personally found that lap swimming has had an incredible effect on the anxiety that I experience. I guess you have to be careful not to overdo it though. But I think cardiovascular exercise (jogging, swimming, bike riding) is great for regulating our breathing and heart rate, I think it sortof brings it back to normal.
I also think that during and after exercise we can misinterpret our normal bodily responses as a panic attack, when infact they are normal and healthy. I know I have done this myself!
Hope you are all doing well
:)