Training plan calls for 6 miles of hills today. I did 4 last week, so I went 5 this week and upped the hill ante - this was a central park run, where the only flat section was (thankfully) towards the end of my run. This workout kicked my ass. I could not have finished six. I was walking a lot, but then I wasn't in any hurry. I concentrated on running UP hills and DOWN hills and walking moderately flat sections. I mostly succeeded.
Seems like everyone is following Yasso's plan - many, many people out in the park jogging the loop.