why do people cover up the display of tread mills with a towel? is it distracting? to know how far you've come, how far you've got to go? is too much information too much? or is it hiding said information from other gym-goers? is how fast you're running or how slow you're walking, is that shameful? is it just a good place to put the towel? i'm not gonna buy that. is it some bit of gym etiquette that I don't know about? why?