I use this system in my workout room, while on the treadmill or on the elliptical crosstrainer. In addition, being in my early fifties, I need reading glasses for any font smaller than 14. Therefore, the buttons are designed to be large and color-coded. This way they can be immediately found even when you are beating the hell out of yourself (in terms of cardio fitness), and even if you are far-sighted (in terms of focal length of your anterior eye chamber).