Thanks for the input, I kind of guessed that would be the case, I knew i was over doing it but I have just got back into the swing of it.
I knew that when I was running 20 - 25 miles a week last year the back of my calves were hurting, I was over doing it.
I spoke to the GAIT people and they have suggested two pairs of trainers as the ones I am currently using are designed for running whereas doing circuit training etc., they do not have the relevant support?
Do I need two pairs or do you think they are just trying to get more money out of me!