As I stepped out of my clothes the other day before taking a shower, I caught a glimpse of my newly formed tan line that marked where my tank top rested during my run that day. Normally, such a sighting calls for a day of mourning which includes slathering every inch of my body with sunscreen, donning shirts, pants, and socks that cover every inch of my body, and spending the rest of the day indoors with the curtains closed. Then I berate myself for not having that same sense of urgency on a daily basis when I should wear sunscreen. My ideal running weather. I'm a white girl. My skin is pale enough that I can use baby powder to set my makeup. Skin cancer runs in my family along with the blonde hair and blue eyes. I often tell people this when they wonder why I'm sitting at the beach under an umbrella with a double-sized towel wrapped around my long-sleeve shirt and sweatpants. It's a lie, but the truth is embarrassing. The truth is that when I look at my naked body i...