I am training for a half marathon that is in two weeks. I just started to get episodes of pain in my rt knee. It happened 1.5 miles into my run last night. I hobbled around for a quarter mile or so i just started on a steep incline. I could bear wgt w/o pain if i walked on my toes on that leg. By the time i had gone a ways like that it feltbetter and i was able to run the rest of the way home with no pain. I ran my trial 13.1 today(i know not super smart) and atmile 6.60 my knee did it again. I hobbled on my toes for about 3yards then i was fine the rest of the way. The pain is behind my knee cap. Not swollen. Very painful when it happens. I was only able to run 4 miles last week r/t my kids birthday and spring. break activities. Prior to this I have averaged about 13-17 miles a week running every other day or so for months.