didn't want to repeat yesterday's problem with my knee, so took extra care to stretch legs. left calf was still tight, and right knee squeaked at me a bit. the trouble with re-starting running is that nothing is smooth. breathing is hard, which makes my stride rough, and that makes all the body parts problematic. but i noticed that when i stopped paying attention to my body and just listened to the music, focused on breathing and kept my head clear of nagging thoughts, i was fine. i was able to add the extra half-mile without any problem. i just have to be careful to keep the pace slow enough to keep the breathing even, which will get easier when i get into shape.