I've logged 430 miles since 1-1-11 in prep for a May 1st full marathon. I'm in my two week taper and I've got some serious discomfort behind both knees. Stretching like mad, weekly deep tissue massage, compression, ice and ibuprofen. With 13 days until the marathon, what have I overlooked? My last long run was 20 miles a few days ago. Do I even do a short run this week? Next week? Any thoughts? This is my second full.