...I have a full calisthenics program 3X a week + running 2 mi every other day (except last night and tonight due to downpours)Recently, I have added lunges in with the calisthenic program for leg strength, but I am still lacking the long mile endurance...
A good book I have purchased was "Conditioning for Outdoor Fitness" by David Musnick, MD, and Mark Pierce, ATC. Excellent training regimens.
Hope this helps all of you.
Have fun.