Training runs missed

I missed several training runs this week because of extra curricular activities. In taking an extra class, I find myself so tired to not be able to run 5 miles or do a training run. It has been very challenging lately. Now, I find myself in pretty decent shape so I will be able to do today's 12 mile long run, even having not run for several days.it won't be easy by any stretch but it will be attainable. However, my reward for this will be to come home and grade some homework, as well as create next weeks homework.