The pain of running

I hurt. Mostly all over. My knees are aching; my ankles creak when I move. My chest feels as though it's in a vise, my breath coming in great, gasping, uneven breaths. My face is red, my hair matted with sweat; my body is sticky with perspiration and my clothes are plastered to my skin with it. My heart is trying to pound its way out of my chest

I had the worst day today, and I've just been out running. My body feels like it's going to tear itself apart, and I've never felt better.