I am managing to get out for walks, one of my daughters is currently home for a few days and we went out together this morning. 8.3k up and down hills and holding a lively conversation the whole time - once upon a time I could never have walked a fraction of that and would have been huffing and puffing the whole way. My cardio is probably suffering from the lack of running but it is still way better than it was and I know my legs are stronger as despite this mornings walk after a cup of tea they are great to keep on going instead of just collapsing on the couch for the rest of the day,
To those still on C25k - it is so worth it for the overall improvement in your health and fitness so just keep going.