My 3 mile run last night was hard. I don't know if it was the low calorie day I had on Monday, the lack of sleep over the weekend, the heat or all of it, but I struggled. But, I did it - got it done, logged in the books and I'm sure my body benefited from it. My training partner (the dog) thought it was tough too :) He actually let me squirt him with the hose when we got home when normally he runs as soon as he hears the water turn on!