Adam - I am of the opinion (and I think my college coach - Patrick Shane told me this) that running is always better than cross training if it is a question of whether to spend 1/2 hour running vs. cross training. I cross trained and weightlifted in college until I hit the 70 mile mark, then my coach told me just to run. The benefit of cross training and weightlifting is the potential injury potential, and everyone's body is different in that regard. Some people can only handle a certain amount of miles before injury onset. I start feeling it at about 70 miles. I will try to go over 70 this summer and see if I can survive, but if I start feeling too hammered, I would consider cross training.
Which comes to my question: What cross-training, if anything, can be done if you don't have a gym membership and you don't have a bike/elliptical or other equipment? I do have weights and could do low weight, high reps and could try to make it aerobic by doing the reps quickly and always moving from station to station. Is there anything else I could do if I felt inclined to cross train, or heaven forbid, if I did get an injury (or a surgery
)?