Okay, thanks guys much appreciated.
The circuit I do is 3 times a week, I use my execise bike for 45 mins 3 times a week also.
By the way, the bits I said I had not mentioned:
I'm 57 years old
got arthritis in my feet
got a frozen shoulder (thats what the Doc recons, I'm not convinced)
bad neck
and had a triple heart bypass in Oct 2006.
But I'm still here and still trying.
Thanks again