Huffin' and Puffin' away

I had not managed to get in a run for 3 plus weeks, and the deterioration in my cardiovascular fitness is shocking. Yesterday, I struggled to do a 3 km run at a fairly slow pace (what used to be my recovery pace), which would have been a literal walk in the park less than a month ago, since I was doing 7 - 8 km every two to three days at a much faster pace (more than a 1 min faster per km). Going to have trouble with the Shape run which is coming up in 2 weeks time! Given this state of affairs, will be happy if I can even complete the 10 km under 1 hour 30 min although my PR is 1 hour 10 min.