10 miles per week

I ran (mostly) 5 miles this morning, like I did last Sunday. My "sustaining" plan is to run 5 miles on the weekend, and 2.5 miles twice during the week, making 10 miles per week. After finishing that half-marathon, I foolishly thought 5 miles would be easy for me. It's weird--it's been pretty tough! Tougher than I remember the 10K race last month was. I think I was pumped up for that, with a healthy respect for the distance, but this Sunday 5 miler I've been underestimating.