I have been browsing through various posts and there seems to be some criticism of some of the rehab services.
My experience has been with the Basingstoke and Alton rehab which has been excellent from a Couple of weeks post stent in February to the post rehab gym sessions I am still attending twice a week.
These sessions are well run, social and reasonably varied with a combination of exercises including cv and weights.
I would recommend continuing based on my expererince and others in the class have been coming for over 20 years.
If yours isnt working for you do try and find a group that does it has opened me up to a new group of like minded (and hearted) people.